Galaxy Explorer holograms have become shaky / unstable

Hi

A couple of weeks ago we realized that on all 5 of our HoloLenses the planets in Galaxy Explorer have become unstable / shaky - especially when you move around the room. Galaxy Explorer up til that point worked perfectly and the holograms were positioned/persisted in space perfectly.

Has anyone else experienced the same behavior? I've tried every trick in the book - except for resetting the HoloLens.

Thanks,
Jens