Whenever I play black ops 4, around 30 minutes into it, my pc shuts off and reboots. It only happens when I play bo4. I can run a heaven's/valley benchmark on ultra for an hour each and it won't replicate the crash that happens when I'm playing. Usually when I play anything my gpu + cpu stays between 50-70 so I'm pretty sure it's not those two. I recently bought a B-stock EVGA 750W G3 PSU, and after reading many sites, I'm going to assume that this is the source of my issues. Any advice or help on what I should do would be amazing.
This is my build - i7 8700k + msi 1080ti + EVGA 750W G3 + 32gb ram 2400mhz