Years later, this helped me a TON @Bigdord. My new PC with 3080ti, i9-12900KF, and 32GB RAM (6k MHz) has been crashing a TON in Atlas since I bought it a few months ago. I tried everything (Low Memory Mode, changing in-game settings, etc....).
My particular problem seems to be that my GPU was running over its maximum temperature limit (83c by default). I noticed that my GPU would hit this limit and then soon after Atlas would crash. Using MSI Afterburner, I decreased both my Core and Memory clocks by -300 and -200 MHz respectively, and increased my GPU temperature limit to 90c for Atlas. These two things combined seem to be keeping the GPU cooler, thereby preventing the game from crashing when the GPU is over-worked. I think if the GPU gets over the temperature limit, it starts slowing down to try to cool off.
I think this process of the GPU trying to cool-down is not handled well by Atlas / Unreal and causes the game to crash. Other Unreal games do not experience this issue, so I think it's Atlas specifically
