The Track Shuffle on my NW-HD3 is behaving oddly. When I select an artist or genre and play in Track Shuffle mode, it plays OK until I stop it. When I start play again, it starts from exactly where it stopped (mid-track), but appears to have forgotten which tracks it has previously played, and will play them again. Sometimes it can play the same track more than once when others have not been played. This is not my understanding of "shuffle", and does not agree with the manual. Has anyone else had the same problem, or could it be a fault with my player?