Craftsman 139.53918D Garage Door Opener
Once in awhile my wife goes to leave in the morning and the garage door opens, but won't close all the way. She tries a few times, gives up, disengages it, closes it manually and leaves. I come home, reengage it, and it works fine. I adjust the FORCE adjustment anyway, which is automatic on this opener. It is not like the old opener where I could just turn the dial and increase the force. This opener operates the door open and closed and "learns" the force that is necessary. I understand the force needs to be adjusted depending on the weather, but it has happened a couple of times now in the winter. Parts are lubricated. It is a 1/2 HP belt drive (very quiet). It was "professionally" installed (IE I paid Sears' contractor) and everything seems to be alligned. The safety reversal sensors are alligned. My wife is getting peeved. Any ideas.