My garage door started doing this more over time. One day I noticed the where the arm attached to the door it was actually pulling free of the door. The sheet metal is thin and the screws aren't holding on to much. So the door was essentially over extending at the bottom of its stroke and forcing itself against the floor leading to the arm problem. Adjusted the travel as per it's instructions then fixed the attachment point. No issues since.
Clean_Subject_6728 t1_j250bs6 wrote
Reply to Garage door stops closing midway and reverses - sensors seem aligned by simon_on_trails
My garage door started doing this more over time. One day I noticed the where the arm attached to the door it was actually pulling free of the door. The sheet metal is thin and the screws aren't holding on to much. So the door was essentially over extending at the bottom of its stroke and forcing itself against the floor leading to the arm problem. Adjusted the travel as per it's instructions then fixed the attachment point. No issues since.