There is another thread where this topic is being discussed that could give you more info. Here's the link: http://community.vzw.com/t5/DROID-Charge-by-Samsung/Samsung-CHARGE-DROPPED-CALLS/td-p/618318
I've been having the "dead air" issue in RI so I think it may be more widespread than AZ. Although maybe more rare in these parts. Not sure just hope it gets fixed.