For some reason my ringer and notifications become disabled. Volume all the way up and not sounds from the ringer or email or system items. I can try and pick another sound but it never plays. Also the media is fine, music and videos all play fine. Only way I have found to get it back is to reboot the phone. Not sure if a program is causing it, but it is driving me up the wall and only happens every so often and it is not from a program I am running cause it is very random, and no one program causes it. Has anyone else run across this?