Occasionally when I wake my phone up the 3g mobile network has shut itself off. It will come back automatically in a few seconds of waking the phone up, but for some reason, it's turning off while asleep. I've noticed this with my wifi as well. I caught this problem because my Gmail has been arriving to my pc, but not my phone. This doesn't happen all the time, but it seems to be happening more lately. Does anyone else experience this issue? It's becoming frustrating.