Games and Firefox suddenly crashing, sometimes the whole PC too.

[Ichirus]

A few months ago, I got a new high-end PC and until yesterday evening I'd never had any problems. Since then, after a few minutes of gaming (ranging from 5 to 15 minutes), the games quit abruptly even though they are running perfectly. The computer doesn't overheat, everything seems normal. I've carried out an "in-place upgrade" of Windows 11, but the problem persists. The BIOS is up to date, the drivers too, Windows doesn't offer me any updates... Last night, my computer forced reboots twice (blue screen appears and warns of a reboot). My antivirus reports no malware. My configuration is as

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