complete pc crash

Aug 25, 2018
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hello everyone,
i've been experiencing alot op pc crashes while playing overwatch or pubg, it doesnt seem to happen with any other games. these crashes appear randomly and dont happen at any specific moment. i can go a week without one and then get 4 in a row. it's not due to over heating since while playing overwatch my pc runs around 50-60°c and in pubg around 75°c. i have tried turning donw setting this also doesnt do anything. my pc runs on a different wall outlet then my monitors and such. the pc doesnt get a bsod or anything it just shuts off instantly like it doesnt have any electricity but i can launch it instantly again.
pc specs: i7 4790
gtx 1070
hyperx 16gb
650w powersuply
1gb network card
180gb ssd
2x 1tb hdd
msi z97 pc mate
coolermaster seidon 120v
can any one help out, thank you for your help