Then this is interesting, and not what I expected to see. I expected these crashes to be related to GPU timeout, but it’s actually a UMG issue. Unfortunately the crash report on our end is missing symbols for some reason, so I can’t see the full details for the callstack.
UE4Editor-UINavigation 0x00000000bf540000 + 164a9
UE4Editor-UINavigation 0x00000000bf540000 + 10eae
UE4Editor-UMG 0x00000000d84f0000 + 163d42
UE4Editor-SlateCore 0x00000000fb410000 + 11de9d
UE4Editor-Slate 0x00000000f5980000 + 2bf8ad
UE4Editor-SlateCore 0x00000000fb410000 + 11e063
If you have around 20GB of free space on your computer, you can add the “Editor Symbols for Debugging” to your engine installation (choose “Options” on the engine slot on the Launcher), and then you will see the full callstacks for your crashes.
I recommend you pull together whatever information you can gather around this, including reproduction steps, and submit a bug report. Report a Bug - Unreal Engine