I had this issue shortly after I built this PC a few years ago after which a month-long diagnostic revealed that the motherboard (ASUS ROG Strix Z790-E) and PSU (EVGA SuperNova 1000W Platinum) were faulty and I managed to get those replaced. I've had a few little issues here and there since then, a few random crashes, my old 4K monitor died, and just an overall bad experience with this PC, but it was working. Last week, I was playing Mount & Blade 2 Bannerlord and during one of the sieges, the entire PC just shut down and restarted like it overheated. I checked the logs and none of my temps were anywhere close to alarming. So I've been keeping Armoury Crate running while playing games just to keep an eye on temps and everything looks normal, but the crashing is becoming more frequent again. So far in the last month, it's crashed once in Escape From Tarkov, a handful of times in Bannerlord, once in Borderlands 2, and once in Binding of Isaac.
I'm honestly completely out of ideas on this one. I've never built a new PC within ten years of building a previous one, but at this point, I don't even want to use this one since it's so inconsistent with the crashing. The only consistency is that it crashes after I've been playing a while which makes me think it's a temperature issue. I do live in the desert and I have pets so the filters build up with dust and pet hair, but I clean them regularly and haven't noticed any issues with any of my fans.
I'm honestly completely out of ideas on this one. I've never built a new PC within ten years of building a previous one, but at this point, I don't even want to use this one since it's so inconsistent with the crashing. The only consistency is that it crashes after I've been playing a while which makes me think it's a temperature issue. I do live in the desert and I have pets so the filters build up with dust and pet hair, but I clean them regularly and haven't noticed any issues with any of my fans.