BB Torch :: 9860 3G Connection Fails - Blocked State

I just bough the Torch 9860 and already replaced another one for the same problem, and since this second have the same problem, I think it is a general problem. Well the thing is that while the phone is in 3G coverage, it sometimes goes to like a "blocked" state. By this, I mean that the phone states as connected to the network and with full signal, but call wouldn't go out nor in, data is also not available, and the most important thing is that the phone doesn't show any signs of disconnection nor anything problem alike. Up until now, I have only seen this happening while in 3G coverage, and when this problem occurs, I switch the phone to 2G only and starts working fine again.