My phone started exhibiting some strange behavior today regarding sound and mic - neither are working (most of the time). If I am receiving a call, the phone will sound the ring, but when I answer it the speaker and mic go dead. If I hit the volume button while the phone is ringing, the speaker also goes dead. When I try to play music, no sound is produced (although if I plug in headphones I find that it is playing). The problem persists after multiple reboots, and the Samsung "song" does play during boot. I'm not sure exactly when this started as it was working fine yesterday.