Pc automatically restarts while playing valhalla.

[Ruckledge]

First it happened once then later it started happening almost everytime i play the game for around 40-50 mins.

 

Specs:

 

R5 3600

RTX 2060

16 gb 3000mhz

b450 aorus elite  

CM 750w

 

CPU temps are max 85 on the stock cooler

GPU temps are max 72

I checked hardisk health with HDD sentinel(its seems fine)

 

Already used DDU nd re-installed the drivers, did'nt help.

 

What could be causing this issue??