Sometimes, when I am using 3g, and browsing or something, the data connection, all of a sudden, becomes a slow trickle. Sometimes, it completely disconnects from the data network, and i get "no data network" errors. My signal is still very good (actually, i'm not moving when this happens), but the speeds just become horrible. So i restart my phone, and it fixes the problem. Is this a problem with my phone, or the data network itself? This happens about once a day.