I've just purchased a Denon 500 and spent the evening setting it up. After following the simple initial set up I inserted a cd and noticed that every 20 seconds the subwoofer and centre speaker were cutting out for about 5 seconds. This continued to happen when I played a dvd, but then after 20 minutes or so of the film the cutting out seemed to stop. Has any one else experienced this? Other than this, the sound and picture are superb. Cheers.