Craftsman door going up and down by itself
All of a sudden, my Craftsman 139.53914D Door Opener started activating by itself. It opened and closed many times within a one hour period before I unplugged it. I activated it with the remote knowing that doing so changes the security code. That didn't stop it. Then, I erased all remote codes by pressing and holding the Learn button. That did not work either. I unplugged it just so I could get some sleep. What could be the problem?