Question PC shutsdown

[kiddanube4]

My computer started shutting down and booting back up after 10 ish minutes whenever i play games without any sort of error messages.
So i decided to run OCCT stress test on my GPU CPU and PSU for 10 minutes straight and my pc did not shutdown i do not get it what causes this kind of problemi think its software related please help me fiz it
Sorry for bad english not my main tongue

 

[rgd1101]

full system spec? include make and model of the psu

what games is crashing?

 

[kiddanube4]

GPU: GTX 1080 ti
CPU: Intel i7 9700K
Motherboard: Asus Rog XI Gene
PSU: Corsair HX1200 1200W 80 plus PSU
RAM: 16 GB RAM
i bought this system back in 2018 so all parts are 2018 model (not completely sure)
Games that crash: Cyberpunk 2077
Monster Hunter:World

 

[kiddanube4]

My heat values when i play heavy load games like Cyberpunk is
80 degrees GPu under %97 load and 60 degrees CPU under %60 ish load

 

[kiddanube4]

Please respond