agreed. Do a network scan from your computer and see what networks you pick up. Check which channels they are on then set your router to something different than them.
I have to have mine set on 3 because my neighbors are already on 1,6, and 11.
Also a battery pull anytime you are having weird issues on a blackberry is usually my first line of defense.
Tmobile | 7100t, 7105t, 8700g, 8320, 8900