Have been having the EXACT same issues. I'm in the twin cities, MN area. Also check out this thread I started about some of the weaknesses of the CDMA system.
I am actually switching back to my trusty and true Nextel 7520 tomorrow as I have had enough of it and can no longer stand using the device as heavily as I do each day.
Link - HowardForums: Your Mobile Phone Community & Resource - Is CDMA really this bad with call handling?