Interesting, I'll look through KGIS and see what's what in there. Might be the position I have the step motor set in that makes it shake. I sit really slow in the car and the HUD is probably much higher than most. There are a series of mirrors in the HUD system, above the actual projector. I am betting mine are loose. Service said the unit is really tight, not moving. I'm guessing I can pop off the trim panel and the top plate and see what might be shifting around.