My classic 160 started to skip this past week. Maybe like a small skip every 10 minutes or so. It also kinda stutters the start of a song when I skip tracks sometimes now. It never did it before. Only thing I did recently is add some more music and some standup DVDs to it. Should I try defragging it or something? All my music is 320kbps mp3. Have about 50gigs of music and 15gigs of video. Thanks!