Pc restarting periodically while gaming

[NoVa_Prime]

Hi Everyone, so I have this issue when I run need for speed heat, valorant and others after like 10mins in NFS heat the pc would turn off and restart. For valorant it takes longer but it will occasionally shut down. I have done stress test on both the cpu and gpu separately and no issues temps were good. I was able to replicate the problem when I ran cinebench and furmark together and it shut down but then I ran a another time and it did not turn off after 5 passes. At first I thought it was the power supply cuz when I used a Corsair 850x power supply it shut down as I stated above then I went to my 650 seasonic focus and it worked fine. So I returned the 850x and got a seasonic 80 plus titanium 850w psu and the issue came back. 
 

FYI This is my Pc Specs

Motherboard: MSI b450 Tomahawk Max

Cooler: NZXT z63 kraken

Ram: 4x8gb G.Skill trident z neo rgb 3600mhz cl18

GPU: ROG Strix 3080ti (thank god for micro center)

PSU: Seasonic 80plus titanium 850w

Case: NZXT H510 (Sorry Steve from gamers nexus)