PC randomly reboots. No BSoDs, power failures...

[lex]

I'm out of ideas.
My PC sometimes (usually at night) randomly reboots.
Event log showing that this was crash (at least it mentions unclean shutdown), but there is no kernel dumps or something that can help tracing this issue.
I tried benchmarking, overloading GPU/CPU/memtest, etc, no luck. Those reboots are completely random and i have no idea where they are coming from. Checked cables, checked grounding as well.
It never rebooted under load, btw. Mostly when sitting fully idle. I will disassemble it soon to check for pregnant capacitors probably...
Any ideas what i should check?

 

[lex]

Ok, as soon as i wrote this post PC rebooted and wrote dump.
Looks like it's driver problem (but why no BSoD, then?), related to xusb22.sys driver, which is xbox 360 controller driver.
Funny thing is, i do not have xbox controller. I do have dualshock4 plugged into that PC, and it emulates xbox controller, so, probably, that was root cause. But i'm still not sure about it.

 

[Montoya]

I guess the next step is to unplug it and see if this still happens.

I hate these kind of bugs!

 

[Buzz Lightyear]

I'm out of ideas.
My PC sometimes (usually at night) randomly reboots.
Event log showing that this was crash (at least it mentions unclean shutdown), but there is no kernel dumps or something that can help tracing this issue.
I tried benchmarking, overloading GPU/CPU/memtest, etc, no luck. Those reboots are completely random and i have no idea where they are coming from. Checked cables, checked grounding as well.
It never rebooted under load, btw. Mostly when sitting fully idle. I will disassemble it soon to check for pregnant capacitors probably...
Any ideas what i should check?

Silly bug. Something so minor causing the system itself to crash.