My PC loss power and restart randomly .

I have my pc for 4 years and it was working fine but it start to black out and restart randomly without the restarting screen , I tried to use DDU to delete my old gpu drive and install a new one but the problem remains , it happen while gaming .

my specs ;

Processor Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz

Installed RAM 12.0 GB DDR 3

Storage 932 GB HDD TOSHIBA DT01ACA100, 238 GB SSD KingFast, 699 GB HDD WDC WD7502ABYS-05A6B0

Graphics Card Radeon RX 570 Series (4 GB), Intel(R) HD Graphics 4600 (113 MB)

MY PSU ; an off brand 600 watt