Weird crashing , my screen freezes then black screen and pc restarts

So i started facing this problem since the past week , i took my pc to many shops and they said there is no problems at all then they said the game security or something is blocking ur bios or motherboard which causes u to crash . So can any1 pls help me ,
I queue deathmatch i only last like 2mins then my screen freezes i black screen and my pc restarts, (it only happens in valorant no any other game)
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