VR mode keeps crashing


I have made a project using datasmith import in Unreal 4.23 and everything works fine (navigation, editing and materials)
I used the template for desktop/VR in Unreal studio.

I want to watch my project in VR, but didn’t succeed. I tried in Unreal 4.23, 4.25 and 4.26
It gives me sometimes (stuttering) image in VR, but it crahes all te time.

Unreal crahes also in VR with my HTC Vive HMD.

I now use the Pimax 8K X HMD for VR.

Hope somebody can help me out?
Thanks in advance!

I migrate the Datasmith project to an unreal VR template and set the settings of my Pimax HMD to upscaling to 4K instead of native 4K.
That’s how far I can see now working, no crahes and good VR images.