FIXED
I have solved the problem games crashing with UE4 fatal error and other sudden game crashes by setting the GPU at ECO MODE and setting the fans at 100% SPEED… that actually fixed the problems I had for a very long time with many games. I have a GTX 1080 I have downloaded an older app called Extreme Gaming Engine from Gigabyte because is the only one that lets me change those settings, check if you are overclocking your GPU, lowering GPU clock has done the trick for me.
Now I can finally play games without issues. It fixed:
-Metro Exodus UE4 fatal error
- Age of Empires 4 shutting down
-Green Hell crash errors on cinematics
-Grounded
-EA WRC UE4 fatal
-F1 23 UE4 fatal
-Insurgency Sandstorm UE4 fatal
many more.
Hope it helps.
Happy gaming