I have a Panasonic RP-91 dvd player. The past 6 months or so, every now & then, the player with just lock up while playing a movie. Sometimes the picture will freeze for anywhere from 45 seconds to a couple of minutes or I'll lose the picture all together. On occasion it will start back up on its own. Generally when the picture is lost the only way to get any response from the player is to physically shut it off. I've used a disk cleaner thinking maybe that would take care of the problem, but it has'nt. Any ideas outside of just replacing it?