dropping calls like a led zeppelin.

[cyborgmexican]

I just got my 6700 a couple weeks ago and finally got it activated a couple days ago (alltel). I immediately upgraded to 6.1 after that. This thing is dropping, or at least i think its dropping, every single call. I am not talking about one out of 3 or five calls but every single time i get on this thing it hangs up anywhere from 15 to 60 seconds into the call. I have 3 bars of signal and am roaming. I never had a problem with my old nokia in this area. Has anyone heard of this type of thing and can it be fixed?