I created a custom mission in the VR environment, with a lot of arty shooting. Often the mission starts to stutter after a while (10 - 20 minutes), so heavily, that the game appear to have crashed (maybe around 0.05 frames per second). But it is still running and I can press Esc and after a while the menu appears. A few times the game actually crashed after I let it run in this heavy stuttering state for a few minutes, waiting for it to recover. I attached the crash dumps below.

Needless to say I'm not using any mods, just vanilla and no complex scripting. {F25689} {F25690}