I just upgraded to a Sprint 8830 from a 7520 (Nextel). I have not noticed any sqeaks, rattles, or loose panels - but have had it for only 2 weeks now. As others have stated, this new BB seems to be fragile - at least that is my impression.
I have had no specific problems with the 8830, but it appears to be more of an suit coat pocket device as opposed to my old 7520 which was a tank - both in looks and durability. I am already taking precuations with the 8830 I would not have thought twice of with the 7520.
Maybe check out another new 8830 at a VZ store and compare it -yours may be broken?