Hi, I'm not sure if it's because of my phone or the OS or the default MP3 app or something else, but I'm having a problem in regards to some of my MP3s. For some reason, after awhile, some of my MP3s will just not play anymore. They do appear in my playlist but when I actually press play, it goes to the next song after it. So I plugged the micro SD into my computer to see what's wrong. Apparently for some strange reason, my computer can't play those "corrupted" MP3s either. The exact error comes up as "The file you are attempting to play has an extension (.mp3) that does not match the file format. Playing the file may result in unexpected behaviour." From that, I'm guessing that my phone is (for whatever reason) changing my MP3s to an unplayable format. Any help?