PC shuts down when playing games

Just recently when playing stuff like assasins creed unity or Dota 2 on max settings my computer hard hangs, audio turns to white noise, and restarts itself sometimes. I unchecked restart auto matically in windows options too.

specs -
i7 4790k
gtx980 ti
16GB ddr3 hyper x memory
psu - corsair cx600
asus maximus ranger vii

steps already taken -
updated bios
updated GPU drivers
scanned for malware
checked PSU voltages, 12v rail looks fine

Hellp !! Just started recently was running fine for a month
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