About once a week I need to do a battery pull on my DROID because both incoming and outgoing calls are silent. I'm not sure if the caller on the other end can hear me or not. In the meantime, I've switched my vocoder options back to the factory default to see if maybe that helps. Really, it's a shot in the dark, but it's a start. Not sure if it's a 2.0.1 issue or not.