With my phone, I originally brought in songs from my computer, just normal mp3 files w/o cover art or anything. I recently started using amazon mp3 and after i bought and downloaded a song from there, songs seem to be disappearing from my music app. when i look in the folder on my computer of my music (mp3 folder), the songs are in there. Though, when i disconnect the sd card from the computer, the songs still aren't visible for whatever reason and eventually are deleted completely off my phone. I know others have had problems similar to this, is there any way to fix it???