Many users have reported that disabling Real-Time Thumbnails made the engine much more stable.
This is one of the widespread D3D Hung crashes that have existed since 4.14. This particular callstack has affected around 300 users. The issue has been successfully reproduced on a home PC.
Dxdiag and log with -d3ddebug are attached
This crash is hardware-dependent and does not reproduce on all systems. Successfully reproduced on a home PC; 4/4 attempts.
The crash seems to require a built-up strain be placed on the GPU. On my home PC, having one Reflection Sphere in the level only crashed after I had swapped out materials on assets, PIE'd, and moved around lights. If I didn't take any other prior actions, then I needed between 2 and 4 Reflection Sphere before the crash would occur.
Fatal error: [Link Removed] [Line: 176] Unreal Engine is exiting due to D3D device being lost. (Error: 0x887A0006 - 'HUNG')
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-40807 in the post.