I think I may have finally figured this one out. I mounted the unit off center of the garage door because I didn’t want it to “see” the drive rail but I think I needed it mounted ever further off center. I have moved it and it seems rock solid now.
I have never gotten mine working correctly. Replacing the power supply seemed to help for a while but it has been terrible since the weather has gotten cold again. I suspect a cold solder joint on one of the boards somewhere.