Im running 2.1, and usually about once a day or every 2 days my sound will stop working. Its out of no where, ill see im getting a call, but the phone isnt ringing. Also i cant hear the person when i answer the call, not sure if they can hear me. Ill try the volume up/dn buttons but hear no ding sound. Only way ive found to get it back is to reboot, any ideas?