Question Why does it restarts randomly while playing games?

Dec 23, 2019
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My pc rig as follows:
CPU: ( i7-4770k @3.50Ghz)
GPU: ( NVIDIA GTX 980TI
PowerSupply: (CoolerMaster MWE Bronze 550)
CPU Cooler: ( CoolerMaster HYPER 212 RGB BLACK EDITION)
RAM: (32GB Corsair DDR3)

My problem started 4 days ago, when i bought Forza Horizon 4, the first 2 days i had no issue playing the game with full performance, suddenly my PC restarted while i was playing Forza Horizon 4. i thought something went wrong, i started the game again after relaunching and the in 30-50 minutes PC restarted again!
All my drivers, updates etc are up to date.
I've checked my temps, volts everything is fine and normal.
I've even changed my PowerSupply to Corsair CX 750m and it the same thing but with more time playing up to 2 hours and then it kept restarting whenever i play or use 3Dmark or Valley Benchmark.

Please help i'm starting to get annoyed a lot not finding the solution.
Notice:

Even if i play Rocket League or PUBG same problem happens.
 
My pc rig as follows:
CPU: ( i7-4770k @3.50Ghz)
GPU: ( NVIDIA GTX 980TI
PowerSupply: (CoolerMaster MWE Bronze 550)
CPU Cooler: ( CoolerMaster HYPER 212 RGB BLACK EDITION)
RAM: (32GB Corsair DDR3)

My problem started 4 days ago, when i bought Forza Horizon 4, the first 2 days i had no issue playing the game with full performance, suddenly my PC restarted while i was playing Forza Horizon 4. i thought something went wrong, i started the game again after relaunching and the in 30-50 minutes PC restarted again!
All my drivers, updates etc are up to date.
I've checked my temps, volts everything is fine and normal.
I've even changed my PowerSupply to Corsair CX 750m and it the same thing but with more time playing up to 2 hours and then it kept restarting whenever i play or use 3Dmark or Valley Benchmark.

Please help i'm starting to get annoyed a lot not finding the solution.
Notice:

Even if i play Rocket League or PUBG same problem happens.

it happens only when i run DS4 to be able to connect my joystick. once i do that my pc restarts from time to time.
when i have it off and play a specif game it wont restart...