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Laptop randomly reboots

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I'll try to keep this short. I bought a used Lenovo T520 back in May. It 
had the motherboard with nvidia GPU. Because it sucks power and doesn't 
really have good suspend/resume support, I bought a used mother board 
off of ebay that only had intel integrated graphics and I swapped it 
out. All was well and I had installed in it 8gb +4gb of ram.

It ran like that for about 8 weeks before I bought an 8gb stick and 
stuck that in, so then I had 8gb + 8gb of ram. After about 6 weeks of 
running like, it randomly rebooted overnight. I shrugged it off and 
thought maybe the power went out or something (even though it had a 
battery in it). But then about 2 weeks later it did it again..and then 
two weeks after that. So I pulled out the new 8gb stick I had put in and 
let it run with just one 8gb stick. It ran like that for about 10 weeks 
without a problem. I put the old 4gb stick in just for fun, bringing it 
back to the original 8gb + 4gb configuration. But about 2 weeks later it 
rebooted again. At that point I bought a matched 16gb kit (8gb + 8gb) 
from new egg that seemed to come recommended from google searching for 
compatible ram for this model. But just a couple of days ago (about 3 
weeks after installing it), it rebooted by itself.

I am kind of at a loss here now. I can buy another motherboard and swap 
it out again, but that takes a few hours and I don't feel like doing it. 
The cooling and thermal stuff is all good on the laptop,I've ran prime95 
and video encoding for hours and it is fine (temps stay below 80* at 
least, normal usage is 40-55*). I've also ran memtest for a few hours.

What I find weird is that the machine suddenly reboots. At least a few 
years ago, ram issues would just lead to a kernel panic screen. But with 
this, the machine is just like someone pulled the plug and rebooted it. 
I started to wonder if there is some built in watchdog somewhere that 
will reboot the machine if it hangs, but I can't tell? Other than that, 
if this is the kernel that is rebooting the machine, is there any way I 
can get it to dump some info somewhere before it fully reboots? Before I 
go through the pain of swapping the board again, I'd just like to really 
know that this is a hardware issue and not the kernel detecting 
something and just choosing to reboot...

Thanks for any info,

Sam

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Laptop randomly reboots Sam Smith <debian@net153.net> - 2017-01-21 03:20 +0100
  Re: Laptop randomly reboots Intense Red <intnsred@golgotha.net> - 2017-01-21 04:50 +0100
  Re: Laptop randomly reboots David Christensen <dpchrist@holgerdanske.com> - 2017-01-21 06:40 +0100
    Re: Laptop randomly reboots Sam Smith <debian@net153.net> - 2017-01-23 23:00 +0100
      Re: Laptop randomly reboots David Christensen <dpchrist@holgerdanske.com> - 2017-01-24 06:20 +0100

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