PC restarts while gaming ( No overheat )

Dec 6, 2018
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My PC restarts only while gaming it happens randomly and this started a week ago my PC specs are as follow FX 8320 which is runing on stock voltage and overclocked to 4.2 ghz ,gigabyte 970a ud3p motherboard, 8gb of ram and a GTX 1070 runing on stocks with cosair VS650 for psu i was runing this setup for the past 2 years and my pc never restarted randomly it only started this week I have tried prime95 with furmark for 30 min i have also cleaned my case and also applied thermal paste where it was needed the temps are also looking fine the cpu temperature sits around 55 on max and gpu sits around 70 the only thing which concerns me is the psu and i have no idea about the voltage and all that stuff can someone help
 
Dec 6, 2018
2
0
10

But the problem is i dont have extra PSU and the restart occurs randomly Ive also heard that this PSU is bad for this system please help