Wirelessly posted (BlackBerry8700/4.1.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)
It is most likely the phone itself. I had a 7100t and people said the same thing. It was intermittent but still a pain in the butt. When I had it replaced under warranty the new handset worked perfectly. I now have an 8700g and it is the best of any of the bb's I've owned. The 8700 is my 7th blackberry.