Kernel Warm Restart

[#1]

In the past couple of days i've had two of these. Ordinarily I wouldn't really question it, but on both occasions it's taken 10 - 15 minutes to get back online. Question is, why is this happening, and is it normal?

[#2]

Is it by a radiator? Has it got enough room around it for ventilation? I sent mine back (Tg589N) but didn't have any problems with the PN supplied router.

[#3]

Assuming that you have the TG582n then it often happens with firmware 8.4.4.J upgrading to 10.2.2.B fixes it
However it doesn't usually happen as often as that

[#4]

It indicates it's rebooted for some reason, not a power dip, that would have been Kernel Cold restart.

[#5]

Nah, don't  really keep my kit near heat sources, it causes too much trouble lol. Something I should have mentioned was I got "Authentication failed" when trying to reconnect. Haven't seen that before. Perhaps a firmware update is the answer, as Oldjim suggests.