Sansa Clip deletes music when I did not delete it

This happened once before. Basically, I listen to the music like normal, when I’m done I turn it off, and when I turn it back on, it goes “Refresh Database” and when I go to listen to music, the player is empty. I didn’t add or delete anything. the Sansa clip did that itself. This happened once before, back in April. Should I just get a new one, or what?