What's wrong with my DVD player?

I own a Denon 2910 DVD player. It has worked flawlessly since I purchased (new) it. The hours on it are very low. The other day while watching (it's not the DVDs, cleaned them, happens in different parts of the DVD etc) a movie the picture freezes and then goes back to the beginning. Happens over and over again. The picture quality, however, is excellent. The longest playing time before a picture freeze, has been 10 minutes, but it happens more like every three or four minutes. Is there anybody who has had this experience with the 2910 or any other player? Thanks in advance. warren