For the last 2 years or so, my PC has been rebooting itself intermittently. There is no discernable pattern to the reboots, only that they seem most likely when I'm just about to press the "save" button.
It seems to come in waves. For instance, it was really bad about 8 months ago. The PC would reboot every 15 minutes. After a while it'd be good for six hours, then reboot again. Then it'd be fine for another week or so and out of the blue, boom. It started again Friday after many months of being fine, and has been problematic since then. Though I did have a 30 hour stretch Sunday where it was fine.
One more thing I've noticed, intentionally rebooting the machine or shutting it down for a while seems to increase the frequency of the problem. But overall it's rewally arbitrary. It makes it really difficult to determine the cause when there is no pattern to it. All I can do is swap out a part and wait for a reboot, and that'd prove that part wasn't the cause.
It's not a software problem as it happens in Windows and Linux. It's not a heat issue as temperatures are normal, and heat isn't in excess. It's happened when the PC is cool and hot, and everywhere inbetween.
I've also ruled out the PSU, GPU, ram, and HDD. Each of these have been removed or swapped out and the problem has still ocurred.
Really all that's left is the motherboard and CPU, but I don't have any spare parts to swap in to test it.
Possibly related, my BIOS is frequently reset. I have to go in and fix my clock, boot order, and other settings. This makes me think it's a motherboard issue, but I know very little about motherboards.
Does anybody have any insight into what the cause of this might be? I've been struggling with this issue for years, and it's causing problems with my work now and needs to be fixed.