I recently did a software update over-the-air, to my Curve 9330, and now it won't play any of the built-in sounds (m4a files) or ANY videos. It still plays mp3 files, so custom ringers still work, but no default sounds are working. I upgraded to v6.0 bundle 3084. Did 2 battery pulls, and after the second, it worked for about 2 hours, then stopped playing them again. Any help is appreciated!