game crashing computer

hey guys ive been having a problem with val crashing my pc every time i run it without fail. over the past 3 weeks, val has opened up fine, run fine for 30 seconds - 10 mins, and then just out of nowhere crashed my pc. no BSOD, just straight crash. it then reboots itself about 30 seconds later. i googled for solutions, and ive tried uninstalling and reinstalling both valorant and vanguard multiple times, switching all of my graphics settings to low, etc, but nothing has worked. anyone know how to fix this?
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