Do a series of burn in tests. CPU intense, GPU intense, RAM intense, storage intense, network intense if you can, one at a time. It might be that one of these subsystems is broken in such a way that it ceases to function under stress. Video games stress the hell out of all of them, so if you can isolate them like this, it might help narrow down the issue.
My bet is on something overheating, or a bad ram stick.
Maybe do a ram test. I had weird crash issues on Linux that I didn't experience in windows for whatever reason. Turned out after a lot of blaming Linux, I had a stick of ram that was trash. I pulled out and now I have 16GB and no crashes instead of 32GB with weird crashes and inexplicable behavior mostly when I browse or game.
I have a ram stick going bad. I only figured out it was a ram issue because I started getting "out of memory" crashes while doing things that used to work perfectly fine. The problem is, I only have one stick and ram costs more than my computer now.
Check your warranty. I recently found a bad stick I bought years ago. Turns out lots of ram has a lifetime warranty
If only, if only. It's a pre-built I got from HP. I never would have if not for the fact that I was able to get it for a steal at only $300, which was about the price of its graphics card at the time.
I had a PSU with one malfunctioning GPU power cable, but I spent a year with a half powered 1080 randomly crashing and cursing the state of linux and nvidia drivers. Memcheck said the ram is fine, temps are fine, other games work fine, it has to be the software! Oops...
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