I recently down loaded music I had on my computer onto my MP3 player. It worked fine for a while then most songs wouldn't play anymore.It shows I have 71 songs but only plays about 25. It automaticaly just skips over songs and now my computer "detects pearl" when I plug it in but wont show the device plugged in on synch catigory on my windows media. I can't bring it up at all on my computer.