Until a few days ago, my music was showing up when i opened the player, but now it doesnt show them at all, as if i dont have any music on it. When i go into the phone using the USB cable, i can see the music there on the card, but the player just doesnt see it when i want to play them. They are all MP3, not DRM, and they were playable a few days ago. Any help or suggestions? Thank you.