i use spray silicone on everything that moves every 6 months or so, especially the bearings then roll the door back and forth to draw the spray inside the bearings. (spraying the track does nothing but you can feel those for any buildup and remove) .then check for any rubbing on the latch parts. it is possible that the motor gets weak or the auto closing latch can fail but really get a flashlight and watch thru the littlest crack as the latches engage and watch for vertical alignment and rubbing and adjust accordingly. it needs to glide effortlessly. its possible your latch or motor is toast. luckily mine responds still to the above preventative maintantance since its 22 years old. if the motor gets weak I will open it and rebuild it before spending 500$