I seem to have pretty much the same problem as you all describe with the exception of it is hot here, not cold. I am in northern Alabama and for the past 10 days it has been over 100 degrees every day. Last night hit the down button and the door went about 6 feet and reversed. I've done the adjustment try, the left unit (sending) is steady green and the right (receiving) is steady yellow. I have moved them around and see no change in the lights, even when one is not pointed at the other. I don't see any breaks in the line but possible I can't see one if there. The unit is a Craftsman 1/2 hp, Model 139.53930D. Any suggestions?