Clip Player will not play

My Clip started acting weird a few days ago. I turned it on but the songs will not play. I can scroll though the song titles, but if press play nothing happens. I plugged it into the computer, Windows says there are 2gb of space being taken up but no files appear in the folders. The songs are still there but I cannot see them.

I tried all sorts of things and nothing worked so I gave up and reformatted it and loaded new music onto the Clip. They all showed up like normal and everything played fine. A week went by and now it is doing it again. Songs show in the menu but do not play.

Any idea what is going on?