I have a Lite-On LH-20A1H drive that is 4 years old. The tray sticks and usually requires the manual release to be used to unlock the tray. I took the drive apart and have noticed that without the tray present the motor has no problem moving the mechanism and for awhile the tray will move when reassembled. But if you leave the unit unused for several minutes it starts to stick again. I was able to find some information on the INTERNET about the motor used for operating the tray. It uses rubber magnets instead of ceramic. My experience with rubber magnets is they weaken over time and I suspect the motor has become too weak to move the mass of the tray and interlocking hardware. Has anyone else come to this same conclusion? Do you know a source of replacement motors? The one used does not appear on the manufacturers active list. The motor is a RF-300EH-1D390 made by MABUCHI MOTOR.