This issue has somewhat faded away for us… No idea why, but perhaps this might help someone as I know how frustrating it can be. Try removing all UDIM textures.
We’re now using 5.2, and the only major changes we’ve tried since updating is that we removed all UDIM texture sets (we only had a few). This seems to have removed our D3D crashes, though messing with some more intensive processes in-engine can result in the regular crashes and Unreal crash reporter popup.