Windows 11 Crashing [shuts down] ONLY 15 to 30 mins into gaming load with root cause undetectable

[FullestAttic472]

First of all, I am a computer engineer, I've tried all I could think of the past few days. I could use some help at this point. PC specs are listed down below.Crashes ONLY during gaming load with root cause undetectable. No other load makes it crash. Only 15 to 30 mins into gaming.Out of nowhere, the PC started crashing [shutting down] whenever I tried to play a game.However, with zero crashes, I ran:- GPU stress-testing tool from UNIGINE at max settings multiple times- Prime95 CPU stress tests for 24h- MemTest86 Pro Edition v.9 [zero errors, both with and without XMP profile active]I checked

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