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From: jkn <jkn+nin@nicorp.co.uk>
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Subject: Re: Anyone else seen this.
Date: Sat, 4 Jul 2026 08:55:57 +0100
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On 04/07/2026 00:30, John Rumm wrote:
> 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
> 
Yeah, I found that just after asking - thanks.
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...