Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is corrupted
The router is rated only to +45°C but that is the recommended limit for flash memory, and the room temperature has been up towards 40°C. which doesn't leave a great deal of margin for router internal heat production.
My query is whether anyone else has seen issues with flash memory in the recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is corrupted
The router is rated only to +45°C but that is the recommended limit for flash memory, and the room temperature has been up towards 40°C. which doesn't leave a great deal of margin for router internal heat production.
My query is whether anyone else has seen issues with flash memory in the recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
sys ver dbg
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is corrupted
The router is rated only to +45°C but that is the recommended limit for flash memory, and the room temperature has been up towards 40°C. which doesn't leave a great deal of margin for router internal heat production.
My query is whether anyone else has seen issues with flash memory in the recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is >corrupted
The router is rated only to +45C but that is the recommended limit for >flash memory, and the room temperature has been up towards 40C. which >doesn't leave a great deal of margin for router internal heat
production.
My query is whether anyone else has seen issues with flash memory in
the recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is corrupted
The router is rated only to +45°C but that is the recommended limit for flash memory, and the room temperature has been up towards 40°C. which doesn't leave a great deal of margin for router internal heat production.
My query is whether anyone else has seen issues with flash memory in the recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to execute
an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is >corrupted
The router is rated only to +45°C but that is the recommended limit for >flash memory, and the room temperature has been up towards 40°C. which >doesn't leave a great deal of margin for router internal heat production.
My query is whether anyone else has seen issues with flash memory in the >recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is corrupted
The router is rated only to +45°C but that is the recommended limit for flash memory, and the room temperature has been up towards 40°C. which doesn't leave a great deal of margin for router internal heat production.
My query is whether anyone else has seen issues with flash memory in the recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
In uk.d-i-y The Natural Philosopher <tnp@invalid.invalid> wrote:
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is
corrupted
The router is rated only to +45°C but that is the recommended limit for
flash memory, and the room temperature has been up towards 40°C. which
doesn't leave a great deal of margin for router internal heat production.
My query is whether anyone else has seen issues with flash memory in the
recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
You can get bit flips from cosmic rays. That's a reason servers have ECC memory:
https://en.wikipedia.org/wiki/Soft_error
Not sure to what extent flash is affected, but many routers nowadays copy their OS into RAM before execution: 'execute in place' is still possible,
but sometimes they store a compressed image in flash to reduce flash cost
and decompress into RAM on boot.
It could also be a RAM chip on the way out.--
The Natural Philosopher wrote:
Recently my router (Draytek 2726) has been spontaneously rebooting.
Don't think my 2865 has, have you been keeping up with recent firmware fixes?
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is
corrupted
The router is rated only to +45°C but that is the recommended limit
for flash memory, and the room temperature has been up towards 40°C.
which doesn't leave a great deal of margin for router internal heat
production.
My query is whether anyone else has seen issues with flash memory in
the recent hear wave.
Surely phones get hotter than this?
I sat my phone on my thunderbolt dock while it was charging, and it complained the battery was getting too hot and stopped the charge.
Genuinely interested in other's experiences.
Just checked, uptime is nearly 2 months, which roughly corresponds to
the most recent draytek downloads on my laptop.
On 03/07/2026 16:21, The Natural Philosopher wrote:
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is
corrupted
The router is rated only to +45°C but that is the recommended limit
for flash memory, and the room temperature has been up towards 40°C.
which doesn't leave a great deal of margin for router internal heat
production.
My query is whether anyone else has seen issues with flash memory in
the recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
I have a Draytek 2927 series - it is not new to me, but was previously
used in a commercial environment with no issues AFAIK.
I have noticed a situation with mine where the connection both wired and wireless) appears to drop momentarily, on occasion (couple of times a
week?)
I recently looked at the log, and saw something similar to what you
describe - the router was in fact rebooting, and the log shows something like:
sys ver dbg
Router Model: Vigor2927ax Version: 4.5.2 English
Profile version: 4.0.0 Status: 1 (0x9de71d0f)
Router IP: 192.168.0.1 Netmask: 255.255.255.0
Firmware Build Date/Time: Feb 12 2026 17:45:01
Router Name: DrayTek
Revision: 6562_fd593bfca2 drayos2015
Router serial no: None
---------firmware exception debug info on cpu0-----------------------------
# etc.
There are a few Draytek support pages around this, and typically they
want to blame the PSU. My PSU is not the original Draytek, but can
supply substantially more current - 4.5A IIRC, so I doubt that is the
issue.
My router is not in one of the hotter places in the house. I have just
felt it now, it is pretty warm though. I may try to lift it up off the
shelf it sits one, for more airflow, to see if that makes a difference
(I should say that I think my issue has pre-dated the recent heatwaves)
J^n
PS:
my router rebooting seems to happen more often when I power up a laptop, ie. new WiFi connection(s) have to be made.
This lends some credence to the idea of it being a PSU issue, at least
in my case. But as I say, I have an overrated PSU connected. Perhaps I
will try the original Draytek one, as an experiment...
In uk.d-i-y The Natural Philosopher <tnp@invalid.invalid> wrote:
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is
corrupted
The router is rated only to +45°C but that is the recommended limit for
flash memory, and the room temperature has been up towards 40°C. which
doesn't leave a great deal of margin for router internal heat production.
My query is whether anyone else has seen issues with flash memory in the
recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
You can get bit flips from cosmic rays. That's a reason servers have ECC memory:
https://en.wikipedia.org/wiki/Soft_error
Not sure to what extent flash is affected, but many routers nowadays copy their OS into RAM before execution: 'execute in place' is still possible,
but sometimes they store a compressed image in flash to reduce flash cost
and decompress into RAM on boot.
It could also be a RAM chip on the way out.
Theo--
In message <1128k1p$3fgrb$1@dont-email.me>, The Natural Philosopher <tnp@invalid.invalid> writes
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is
corrupted
The router is rated only to +45°C but that is the recommended limit
for flash memory, and the room temperature has been up towards 40°C.
which doesn't leave a great deal of margin for router internal heat
production.
My query is whether anyone else has seen issues with flash memory in
the recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
I've got a Vigor 2865 which rebooted a week or so back, there wasn't a
power cut, so I'm assuming that the router did it itself. I thought I
had logging turned on, but apparently not.
The room it is in doesn't get that warm (upper 20s at the time).
Adrian
On 7/3/26 16:21, The Natural Philosopher wrote:
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is
corrupted
The router is rated only to +45°C but that is the recommended limit
for flash memory, and the room temperature has been up towards 40°C.
which doesn't leave a great deal of margin for router internal heat
production.
My query is whether anyone else has seen issues with flash memory in
the recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
Dunno about any of that but my VDSL modem crashes in warm weather.
Taking the board out of the plastic case and blowing a USB desk fanI've had one genuine outage on mine. In a couple of years. Sometimes it
across it seems to sort it out.
This year it pissed me off enough to order FTTH.
On 03/07/2026 16:45, jkn wrote:
On 03/07/2026 16:21, The Natural Philosopher wrote:Yes. that is significant. Its the next bit of the log before the
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code
is corrupted
The router is rated only to +45°C but that is the recommended limit
for flash memory, and the room temperature has been up towards 40°C.
which doesn't leave a great deal of margin for router internal heat
production.
My query is whether anyone else has seen issues with flash memory in
the recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
I have a Draytek 2927 series - it is not new to me, but was previously
used in a commercial environment with no issues AFAIK.
I have noticed a situation with mine where the connection both wired
and wireless) appears to drop momentarily, on occasion (couple of
times a week?)
I recently looked at the log, and saw something similar to what you
describe - the router was in fact rebooting, and the log shows
something like:
sys ver dbg
Router Model: Vigor2927ax Version: 4.5.2 English
Profile version: 4.0.0 Status: 1 (0x9de71d0f)
Router IP: 192.168.0.1 Netmask: 255.255.255.0
Firmware Build Date/Time: Feb 12 2026 17:45:01
Router Name: DrayTek
Revision: 6562_fd593bfca2 drayos2015
Router serial no: None
---------firmware exception debug info on
cpu0-----------------------------
# etc.
registers dump that is significant
Mine said (in shorthand) 'The CPU tried to execute an instruction that
does not exist'
On 03/07/2026 16:21, The Natural Philosopher wrote:
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is
corrupted
The router is rated only to +45°C but that is the recommended limit
for flash memory, and the room temperature has been up towards 40°C.
which doesn't leave a great deal of margin for router internal heat
production.
My query is whether anyone else has seen issues with flash memory in
the recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
Not noticed any particular pattern of reboots with the current one
(2927), the previous 2865 might have restarted more frequently - but
even then only 2 or 3 times a year.
(I think if they detect a sequence of boot time fails, they will revert
to the previous version of the firmware just in case it was a firmware update that caused the problem)
The FTTP sometimes drops out for 10 mins at midnight once every few
weeks, but I expect that is a ISP issue or something on the PON.
I have a temperature sensor plugged into one of the USB ports on the
router, and the graph is showing a daily cycle between 40.2 and 40.6 deg
C at the moment. (it is in a 12U 19" comms cab - but the door is open)
If the behavior is consistent across reboot that suggests a problem
somewhere more persistent than RAM. Flash corruption would be my first
guess.
sys ver dbg
and decompress into RAM on boot.
Page caching can make RAM corruption very persistent (albeit not across
a reboot). A while back chiark’s /bin/cat developed a single-bit error
in the cached copy of the code section, which was used (without
reloading) every time it is executed.
On 03/07/2026 21:15, John Rumm wrote:
On 03/07/2026 16:21, The Natural Philosopher wrote:
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code
is corrupted
The router is rated only to +45°C but that is the recommended limit
for flash memory, and the room temperature has been up towards 40°C.
which doesn't leave a great deal of margin for router internal heat
production.
My query is whether anyone else has seen issues with flash memory in
the recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
Not noticed any particular pattern of reboots with the current one
(2927), the previous 2865 might have restarted more frequently - but
even then only 2 or 3 times a year.
(I think if they detect a sequence of boot time fails, they will
revert to the previous version of the firmware just in case it was a
firmware update that caused the problem)
The FTTP sometimes drops out for 10 mins at midnight once every few
weeks, but I expect that is a ISP issue or something on the PON.
I have a temperature sensor plugged into one of the USB ports on the
router, and the graph is showing a daily cycle between 40.2 and 40.6
deg C at the moment. (it is in a 12U 19" comms cab - but the door is
open)
Hi John
how does that temperature sensor bit work please?
There is a 'USB Application | Temperature Sensor' menu entry on my
Draytek,
On 03/07/2026 22:16, The Natural Philosopher wrote:
On 03/07/2026 16:45, jkn wrote:
On 03/07/2026 16:21, The Natural Philosopher wrote:Yes. that is significant. Its the next bit of the log before the
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code
is corrupted
The router is rated only to +45°C but that is the recommended limit
for flash memory, and the room temperature has been up towards 40°C. >>> which doesn't leave a great deal of margin for router internal heat
production.
My query is whether anyone else has seen issues with flash memory in
the recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
I have a Draytek 2927 series - it is not new to me, but was previously
used in a commercial environment with no issues AFAIK.
I have noticed a situation with mine where the connection both wired
and wireless) appears to drop momentarily, on occasion (couple of
times a week?)
I recently looked at the log, and saw something similar to what you
describe - the router was in fact rebooting, and the log shows
something like:
sys ver dbg
Router Model: Vigor2927ax Version: 4.5.2 English
Profile version: 4.0.0 Status: 1 (0x9de71d0f)
Router IP: 192.168.0.1 Netmask: 255.255.255.0
Firmware Build Date/Time: Feb 12 2026 17:45:01
Router Name: DrayTek
Revision: 6562_fd593bfca2 drayos2015
Router serial no: None
---------firmware exception debug info on
cpu0-----------------------------
# etc.
registers dump that is significant
Mine said (in shorthand) 'The CPU tried to execute an instruction that does not exist'
Yes, my log has:
---------firmware exception debug info on cpu0-----------------------------
EPC=60034b60, Cause=00800014, Status=1100fc03, BadAddr=00000000, RetAddr=60034a58
exception id=5(ADES: Address Error Store)
exception occured in TASK Level
task_id=161, SP=0x629390b8(3188 bytes free, 5664 used bytes)
system tick =26381273
CURRENT_VERSION : 4.5.2_RC5
get from address : 60017000
Dump CPU0 registers:
...
but if you look eg. here:
https://www.draytek.co.uk/support/guides/kb-troubleshoot-reboot
they list a log like this - this seems a 'normal' feature of reboot
issues, without considering flash failure.
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is corrupted
The router is rated only to +45°C but that is the recommended limit for flash memory, and the room temperature has been up towards 40°C. which doesn't leave a great deal of margin for router internal heat production.
My query is whether anyone else has seen issues with flash memory in the recent hear wave.
Surely phones get hotter than this?
In uk.d-i-y jkn <jkn+nin@nicorp.co.uk> wrote:
On 03/07/2026 22:16, The Natural Philosopher wrote:
On 03/07/2026 16:45, jkn wrote:
On 03/07/2026 16:21, The Natural Philosopher wrote:Yes. that is significant. Its the next bit of the log before the
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code
is corrupted
The router is rated only to +45°C but that is the recommended limit >>>>> for flash memory, and the room temperature has been up towards 40°C. >>>>> which doesn't leave a great deal of margin for router internal heat
production.
My query is whether anyone else has seen issues with flash memory in >>>>> the recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
I have a Draytek 2927 series - it is not new to me, but was previously >>>> used in a commercial environment with no issues AFAIK.
I have noticed a situation with mine where the connection both wired
and wireless) appears to drop momentarily, on occasion (couple of
times a week?)
I recently looked at the log, and saw something similar to what you
describe - the router was in fact rebooting, and the log shows
something like:
; sys ver dbg
Router Model: Vigor2927ax Version: 4.5.2 English
Profile version: 4.0.0 Status: 1 (0x9de71d0f)
Router IP: 192.168.0.1 Netmask: 255.255.255.0
Firmware Build Date/Time: Feb 12 2026 17:45:01
Router Name: DrayTek
Revision: 6562_fd593bfca2 drayos2015
Router serial no: None
---------firmware exception debug info on
cpu0-----------------------------
# etc.
registers dump that is significant
Mine said (in shorthand) 'The CPU tried to execute an instruction that
does not exist'
Yes, my log has:
---------firmware exception debug info on cpu0----------------------------- >> EPC=60034b60, Cause=00800014, Status=1100fc03, BadAddr=00000000,
RetAddr=60034a58
exception id=5(ADES: Address Error Store)
exception occured in TASK Level
task_id=161, SP=0x629390b8(3188 bytes free, 5664 used bytes)
system tick =26381273
CURRENT_VERSION : 4.5.2_RC5
get from address : 60017000
Dump CPU0 registers:
...
but if you look eg. here:
https://www.draytek.co.uk/support/guides/kb-troubleshoot-reboot
they list a log like this - this seems a 'normal' feature of reboot
issues, without considering flash failure.
That looks like MIPS. The Cause register bits 2-6 gives you the type of exception. For yours:
Cause[6:2] = 5 which means 'Store to illegal address'
TNP's has:
Cause[6:2] = 10 which means 'Reserved instruction'
codes from:
http://www.cs.iit.edu/~virgil/cs470/Labs/Lab7.pdf
They are different types of exception, even if the information is presented in the same way.
Theo
On 03/07/2026 22:32, jkn wrote:
On 03/07/2026 21:15, John Rumm wrote:
On 03/07/2026 16:21, The Natural Philosopher wrote:
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code
is corrupted
The router is rated only to +45°C but that is the recommended limit
for flash memory, and the room temperature has been up towards 40°C. >>>> which doesn't leave a great deal of margin for router internal heat
production.
My query is whether anyone else has seen issues with flash memory in
the recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
Not noticed any particular pattern of reboots with the current one
(2927), the previous 2865 might have restarted more frequently - but
even then only 2 or 3 times a year.
(I think if they detect a sequence of boot time fails, they will
revert to the previous version of the firmware just in case it was a
firmware update that caused the problem)
The FTTP sometimes drops out for 10 mins at midnight once every few
weeks, but I expect that is a ISP issue or something on the PON.
I have a temperature sensor plugged into one of the USB ports on the
router, and the graph is showing a daily cycle between 40.2 and 40.6
deg C at the moment. (it is in a 12U 19" comms cab - but the door is
open)
Hi John
how does that temperature sensor bit work please?
Plug into USB port, and....
There is a 'USB Application | Temperature Sensor' menu entry on my
Draytek,
Click on that menu entry :-)
but I don't know what it needs to work...
Mine was the original Draytek one, however have a look at:
https://www.draytek.co.uk/support/guides/kb-usb-thermometer-source
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is corrupted
The router is rated only to +45°C but that is the recommended limit for flash memory, and the room temperature has been up towards 40°C. which doesn't leave a great deal of margin for router internal heat production.
My query is whether anyone else has seen issues with flash memory in the recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
On 04/07/2026 00:30, John Rumm wrote:
On 03/07/2026 22:32, jkn wrote:Yeah, I found that just after asking - thanks.
On 03/07/2026 21:15, John Rumm wrote:
On 03/07/2026 16:21, The Natural Philosopher wrote:
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code >>>>> is corrupted
The router is rated only to +45°C but that is the recommended limit >>>>> for flash memory, and the room temperature has been up towards
40°C. which doesn't leave a great deal of margin for router
internal heat production.
My query is whether anyone else has seen issues with flash memory
in the recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
Not noticed any particular pattern of reboots with the current one
(2927), the previous 2865 might have restarted more frequently - but
even then only 2 or 3 times a year.
(I think if they detect a sequence of boot time fails, they will
revert to the previous version of the firmware just in case it was a
firmware update that caused the problem)
The FTTP sometimes drops out for 10 mins at midnight once every few
weeks, but I expect that is a ISP issue or something on the PON.
I have a temperature sensor plugged into one of the USB ports on the
router, and the graph is showing a daily cycle between 40.2 and 40.6
deg C at the moment. (it is in a 12U 19" comms cab - but the door is
open)
Hi John
how does that temperature sensor bit work please?
Plug into USB port, and....
There is a 'USB Application | Temperature Sensor' menu entry on my
Draytek,
Click on that menu entry :-)
but I don't know what it needs to work...
Mine was the original Draytek one, however have a look at:
https://www.draytek.co.uk/support/guides/kb-usb-thermometer-source
Looks like these are about a tenner each, from various sources. I guess
I was hoping there was a mechanism to report the router's *internal* temperature though...
Agreed - but my point was, PSU issues could cause any or all of these...
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
Not router or flash memory but I had experience of set top boxes
overheating and becoming unreliable usually because the feet they fit to
the boxes only allows a few millimetres of air to circulate under the
box. I've often fitted taller feet and/or put the boxes on a a couple of pieces of 2"x1" timber to increase the air flow beneath the box. Also I don't stack one box on top of another that may be generating heat nor operate the boxes in an enclosed cabinet.
On 2026-07-04, alan_m <junk@admac.myzen.co.uk> wrote:
Not router or flash memory but I had experience of set top boxes
overheating and becoming unreliable usually because the feet they fit to
the boxes only allows a few millimetres of air to circulate under the
box. I've often fitted taller feet and/or put the boxes on a a couple of
pieces of 2"x1" timber to increase the air flow beneath the box. Also I
don't stack one box on top of another that may be generating heat nor
operate the boxes in an enclosed cabinet.
I stood ours on its side; that seemed to help.
On 03/07/2026 16:21, The Natural Philosopher wrote:
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is
corrupted
The router is rated only to +45C but that is the recommended limit for
flash memory, and the room temperature has been up towards 40C. which
doesn't leave a great deal of margin for router internal heat production.
My query is whether anyone else has seen issues with flash memory in the
recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
Not router or flash memory but I had experience of set top boxes
overheating and becoming unreliable usually because the feet they fit to
the boxes only allows a few millimetres of air to circulate under the
box. I've often fitted taller feet and/or put the boxes on a a couple of >pieces of 2"x1" timber to increase the air flow beneath the box. Also I >don't stack one box on top of another that may be generating heat nor >operate the boxes in an enclosed cabinet.
In article <nas58eFlreU1@mid.individual.net>, alan_m
<junk@admac.myzen.co.uk> scribeth thus
On 03/07/2026 16:21, The Natural Philosopher wrote:
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is
corrupted
The router is rated only to +45°C but that is the recommended limit for >>> flash memory, and the room temperature has been up towards 40°C. which
doesn't leave a great deal of margin for router internal heat production. >>> My query is whether anyone else has seen issues with flash memory in the >>> recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
Not router or flash memory but I had experience of set top boxes
overheating and becoming unreliable usually because the feet they fit to
the boxes only allows a few millimetres of air to circulate under the
box. I've often fitted taller feet and/or put the boxes on a a couple of
pieces of 2"x1" timber to increase the air flow beneath the box. Also I
don't stack one box on top of another that may be generating heat nor
operate the boxes in an enclosed cabinet.
And.. change the mostly useless power supply Capacitors!..
On 7/3/2026 11:21 PM, The Natural Philosopher wrote:
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
I wish it's not a Y2K problem that's not
yet fixed. Did you update to the latest
firmware?
On 2026-07-04, alan_m <junk@admac.myzen.co.uk> wrote:
Not router or flash memory but I had experience of set top boxes
overheating and becoming unreliable usually because the feet they fit to
the boxes only allows a few millimetres of air to circulate under the
box. I've often fitted taller feet and/or put the boxes on a a couple of
pieces of 2"x1" timber to increase the air flow beneath the box. Also I
don't stack one box on top of another that may be generating heat nor
operate the boxes in an enclosed cabinet.
I stood ours on its side; that seemed to help.
In article <nas58eFlreU1@mid.individual.net>, alan_m
<junk@admac.myzen.co.uk> scribeth thus
On 03/07/2026 16:21, The Natural Philosopher wrote:
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is
corrupted
The router is rated only to +45°C but that is the recommended limit for >>> flash memory, and the room temperature has been up towards 40°C. which
doesn't leave a great deal of margin for router internal heat production. >>> My query is whether anyone else has seen issues with flash memory in the >>> recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
Not router or flash memory but I had experience of set top boxes
overheating and becoming unreliable usually because the feet they fit to
the boxes only allows a few millimetres of air to circulate under the
box. I've often fitted taller feet and/or put the boxes on a a couple of
pieces of 2"x1" timber to increase the air flow beneath the box. Also I
don't stack one box on top of another that may be generating heat nor
operate the boxes in an enclosed cabinet.
And.. change the mostly useless power supply Capacitors!..
And.. change the mostly useless power supply Capacitors!..
Is this actually true, specifically referring to Draytek routers? Or
just to Set Top Boxen (in which case I probably agree)
I have previously looked for reports of such problems with Draytek kit,
and found none. I also took a look inside my previous Draytek router
(when I was getting ADSL issues, see uk.d-i-y thread passim) and all the caps looked good (visual only check, I agree)
On 04/07/2026 23:19, jkn wrote:
No. And in fact mostly today capacitors are not as prone to failure asAnd.. change the mostly useless power supply Capacitors!..
Is this actually true, specifically referring to Draytek routers? Or
just to Set Top Boxen (in which case I probably agree)
they once were.
There was a period where bad chemistry was taking out millions of them.
They have all gone
I have previously looked for reports of such problems with Draytek
kit, and found none. I also took a look inside my previous Draytek
router (when I was getting ADSL issues, see uk.d-i-y thread passim)
and all the caps looked good (visual only check, I agree)
The Draytek self-reboot is well documented. PSU degradation or firmware
bit rot seems the most common cause
On 04/07/2026 22:05, tony sayer wrote:
In article <nas58eFlreU1@mid.individual.net>, alan_m
<junk@admac.myzen.co.uk> scribeth thus
On 03/07/2026 16:21, The Natural Philosopher wrote:
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is >>>> corrupted
The router is rated only to +45°C but that is the recommended limit for >>>> flash memory, and the room temperature has been up towards 40°C. which >>>> doesn't leave a great deal of margin for router internal heat
production.
My query is whether anyone else has seen issues with flash memory in
the
recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
Not router or flash memory but I had experience of set top boxes
overheating and becoming unreliable usually because the feet they fit to >>> the boxes only allows a few millimetres of air to circulate under the
box. I've often fitted taller feet and/or put the boxes on a a couple of >>> pieces of 2"x1" timber to increase the air flow beneath the box. Also I
don't stack one box on top of another that may be generating heat nor
operate the boxes in an enclosed cabinet.
And.. change the mostly useless power supply Capacitors!..
in the past 20(ish) years I've changed dodgy electrolytic capacitors in
two set top boxes, one Samsung TV and a Netgear router.
On 7/4/26 09:52, Mr. Man-wai Chang wrote:
On 7/3/2026 11:21 PM, The Natural Philosopher wrote:
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
I wish it's not a Y2K problem that's not
yet fixed. Did you update to the latest
firmware?
Draytek self-reboot is well documentedhttps://www.draytek.com/support/knowledge-base/5763
n the past 20(ish) years I've changed dodgy electrolytic capacitors in
two set top boxes, one Samsung TV and a Netgear router.
I've done plenty as well - two Topfield PVRs, at least one PC
Motherboard, and quite a few Power Supply Adapters for starters. But I
do not think the Draytek has a problem here.
On 04/07/2026 23:19, jkn wrote:
No. And in fact mostly today capacitors are not as prone to failure asAnd.. change the mostly useless power supply Capacitors!..
Is this actually true, specifically referring to Draytek routers? Or
just to Set Top Boxen (in which case I probably agree)
they once were.
There was a period where bad chemistry was taking out millions of them.
They have all gone
On 05/07/2026 09:18, alan_m wrote:
On 04/07/2026 22:05, tony sayer wrote:
In article <nas58eFlreU1@mid.individual.net>, alan_m
<junk@admac.myzen.co.uk> scribeth thus
On 03/07/2026 16:21, The Natural Philosopher wrote:
Recently my router (Draytek 2726) has been spontaneously rebooting.
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware code is >>>>> corrupted
The router is rated only to +45°C but that is the recommended limit >>>>> for
flash memory, and the room temperature has been up towards 40°C. which >>>>> doesn't leave a great deal of margin for router internal heat
production.
My query is whether anyone else has seen issues with flash memory
in the
recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
Not router or flash memory but I had experience of set top boxes
overheating and becoming unreliable usually because the feet they
fit to
the boxes only allows a few millimetres of air to circulate under the
box. I've often fitted taller feet and/or put the boxes on a a
couple of
pieces of 2"x1" timber to increase the air flow beneath the box. Also I >>>> don't stack one box on top of another that may be generating heat nor
operate the boxes in an enclosed cabinet.
And.. change the mostly useless power supply Capacitors!..
in the past 20(ish) years I've changed dodgy electrolytic capacitors
in two set top boxes, one Samsung TV and a Netgear router.
I've done plenty as well - two Topfield PVRs, at least one PC
Motherboard, and quite a few Power Supply Adapters for starters. But I
do not think the Draytek has a problem here.
for repair the difference in price for sourcing a one off of the better specified capacitor is minimal vs the cost of 85c capacitor. The recommendation is to always go for the capacitor rated at 105C, and with
a low Z, low equivalent series resistance (ESR) if fitting to a power supply.
On 05/07/2026 10:40, jkn wrote:
On 05/07/2026 09:18, alan_m wrote:
On 04/07/2026 22:05, tony sayer wrote:
In article <nas58eFlreU1@mid.individual.net>, alan_m
<junk@admac.myzen.co.uk> scribeth thus
On 03/07/2026 16:21, The Natural Philosopher wrote:
Recently my router (Draytek 2726) has been spontaneously rebooting. >>>>>>
Examination of the logs show a kernel panic caused by 'attempt to
execute an illegal instruction'.
My assumption, possibly erroneous, is that the actual firmware
code is
corrupted
The router is rated only to +45°C but that is the recommended
limit for
flash memory, and the room temperature has been up towards 40°C. >>>>>> which
doesn't leave a great deal of margin for router internal heat
production.
My query is whether anyone else has seen issues with flash memory >>>>>> in the
recent hear wave.
Surely phones get hotter than this?
Genuinely interested in other's experiences.
Not router or flash memory but I had experience of set top boxes
overheating and becoming unreliable usually because the feet they
fit to
the boxes only allows a few millimetres of air to circulate under the >>>>> box. I've often fitted taller feet and/or put the boxes on a a
couple of
pieces of 2"x1" timber to increase the air flow beneath the box.
Also I
don't stack one box on top of another that may be generating heat nor >>>>> operate the boxes in an enclosed cabinet.
And.. change the mostly useless power supply Capacitors!..
in the past 20(ish) years I've changed dodgy electrolytic capacitors
in two set top boxes, one Samsung TV and a Netgear router.
I've done plenty as well - two Topfield PVRs, at least one PC
Motherboard, and quite a few Power Supply Adapters for starters. But I
do not think the Draytek has a problem here.
I had my Topfield apart twice for capacitors. Initially is was thought
that only a couple of values had problems but then a couple more years
down line it was found that other capacitors in the power supply failed.
The failure was progressive and caused some power supply output voltages
to rise significantly and if left too long took a out a tuner
transistor. Luckily all of this was fully documented by users and the instructions for repair could be found on line.
On 05/07/2026 10:38, jkn wrote:
Draytek self-reboot is well documentedhttps://www.draytek.com/support/knowledge-base/5763
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