Others have posted to this forum from Maryland, complaining about dropped calls as well. If the situation in AZ that DC5_K20Z1 was actually a network problem, as he describes, perhaps the same thing is happening in MD. You should look at the other threads and follow the steps suggested there to escalate the issue to VZW, and at least find out if they are aware of the situation, are taking steps to fix it and when the fix might be completed.