I spent 3 days this last weekend with D3D11 crashes, NVidia 2080Ti. The problem was actually the NVidia driver, it’s a nightmare. I turned on driver debugging in the registry and watched Unreal receive reset after reset and black screens (but because I turned off the reset message from the OS it didn’t quit). When I went back to the Nvidia driver that Windows 10 update provides (uninstalled the latest display driver), everything stabilized. I haven’t had an unreal crash all day today.