We have a Model 139.53627SRT opener on each of our garage doors and for seven years they have run flawlessly. A couple of months ago the doors started randomly opening and closing (including landing on the car). These openers have the green SRT button on the side with the little green LED nearby. One of the strange things we noticed when we had that problem was that the little green LED flashes constantly at a widely variable rate. Eventually for that problem we managed through unplugging the units and pushing the green button to get the unit to stop its erratic behavior. We programmed it again and it worked well until today. Today we are randomly seeing the doors open and close just sometimes it works and sometimes it doesn't from the transmitter. Have changed all remote batteries and one is actually the homelink system in our Volvo. Wondering if it is the heat here in the Dallas area or if something else might be causing the problem (like a new RF source in the neighborhood). Have called Sears and their position is either buy a new part or have a service man come see you but there is no one here with a knowledge base to shed any light on the problem. I did notice that there is a new receiver board used for this opener and wonder if this is an RF interference issue if the newest boards have better shielding. Thanks for reading my War and Peace length message. NT