Maybe this is related: UE4.19 VR crash when playing - XR Development - Unreal Engine Forums
Happens with a unmodified, newly created VR Template project. Can you please check this? Create a new project with VR Template, then go to motioncontrollermap, VR Preview, and play around for a few minutes. Crash occurs within 2-5 minutes. SteamVR release, SteamVR beta, newest NVidia Drivers.