I have a Harman Kardon CD changer HK FL8300. After I play CDs for a while (over 30mins or so), I can't close the tray after I open it. The strange thing is I don't have problem if I change CD(s) while it's still playing a CD. If I stop the player and open the tray, it won't close again until a few house later. It's so annoying. Does anyone know what's going on? I had this problem soon after I got the player.