The open/close button on this unit is poorly made and only lasts awhile, but there is a button on the remote too. Then push the tray in by hand and avoid using the button at all. Mine is at the point now that a slight touch will close the tray but I have to heavy hand it (well finger it) to get it to open and it often clunks afew times before it does but it doesn't open on its own. That might indicate the set top button is making contact without pressing it. If thats the case maybe a slight tug upwards with some tape may lift it away from contact and if that works then stop using it