Stuttering VR Preview even if i create a starter project only

Hi,
i have a problem with the vr preview.
If i start it the camera is like shaking/jittering or stuttering, even if i just create a new vr starter project.
i have a RTX 3090 and a Ryzen 9 3900X the hardware isnt under full load.
But in the headset and the WMR Preview (not so impressive as vr) the image is flickering while roatating even while standing nearly still the image jitters arround. In the unreal preview window you dont notice anything from that jittering.
Has anyone an idea? It workt a few months before, but now i dont find a soulution.
Thanks