don't know why, but all of a sudden my media volume switched to mute and will not let me change it i have a shortcut on the home screen to toggle from normal>>vibrate>>silent, but it is set to normal. when i go to settings>>sound>>volume, there are multiple bars for the various sound profiles (ex. ringer, notification, media...) and the media bar is at zero. I move the slider over to increase volume, but the second I exit the volume control and return, it is back at zero. WHAT IS GOING ONNNNN????? thanks!