Question PC shuts down after a few hours of gaming

[Deleted member 2923636]

Dec 2021 I build this PC. It turned on the first few tries, and then it shut down and didn't turn on again.
The PSU was dead so I replaced it.

But after about two months (maybe after upgrading to windows 11??), the PC shuts down randomly after a few hours of gaming.
Usually it won't restart immediately, but only after a couple of minutes.
In some rare cases it doesn't shut down, but it will restart.

I'm having problems pinpointing what is causing this. I've tried monitoring the temperatures, but nothing seems really out of the ordinary.

Asus TUF GAMING Z690-PLUS D4
Intel Core i5 12600K processor
ASUS TUF GeForce RTX 3080 OC 10GB V2 LHR
Corsair 16 GB DDR4-3600
Noctua NH-U12S
Corsair RM850x White PSU
SAMSUNG 980 PRO, 1 TB SSD

Does anyone have any suggestions?

 

[Deleted member 362816]

While that is a good power supply, Same unit as mine it sounds like a power supply issue again. Sadly enough I knew this was going to have a 3080 in it when I read the title. Nothing but issues with those it seems in regards to similar problems.

 

[Grobe]

I'm having problems pinpointing what is causing this. I've tried monitoring the temperatures, but nothing seems really out of the ordinary.

What tool did you use to monitor temperatures?

It sure sounds like temperature can be an issue, but not all components have their own temperature censor.

Also - does this happens in all games, or only some few ?