I had the same thing happen to me, but not till it got colder. My take is that the rails may have shrunk due to the cold weather providing more resistance. I upped the switches on the back to maximum and that took care of that. Now, 1 month later, I've got a new problem. For some reason my garage door won't go down. Regardless of wether I use the remote or the wall switch, the motor hums, but nothing moves, even after I disconnected the door.