I noticed a similar thread by another member. However, my problem is not constant. Sometimes, and as far as I can see it's random, my phone cannot play the music files I have on my SD card. I've tried the stock player and Mixzing. The music is WMA format. Sometimes it'll play the first few seconds, then stop. Sometimes, when I press party shuffle after it says it can't play it plays! This is not just one album, but any of them. Other times it works fine. Is it the WMA format? If I re-rip as MP3 will that help? It's annoying when I think I'm going to listen to an album on a bike ride and then can't!