Yeah, I was thinking it was the motor. Thought maybe a mount or other technology piece versus the component itself, but I am sure someone will chime in. My ’09 5 only does it occasionally, my son’s does it more frequent and my new 3i does it about 50% of the time. I am concerned that they have not taken care of this issue from their end (design/engineering, components) as I know it has been as issue over the years. I agree that Vex is more reliable overall, but I still love my detail over theirs. Only other issue I have had with Marcum has been with the charger from the 3tc model.