I have a Sony DVP NS325 that stutters on playback of movies recorded with my DVD Recorder. By stutters I mean playback will pause for a fraction of a second (not skip) then it will continue to play. It may do this a number of time during the movie. Same movie plays OK on other DVD Players, Media is TYG02, I did try a lens cleaning disc with no joy. Should I take it apart and try to clean the lens?