Every now and then, my sound will completely turn off on my droid. My phone will still vibrate when someone calls, but when I answer I hear nothing. When I call back, my phone shows a call in progress, but I don't hear a sound. This problem will also pop up when it comes to the music. The only way to fix it seems to be powering down and then back up. Is anyone else having this issue. If so, any remedies?