Ok here is the run down

3g iphone
I'm on 3.0.1 re jailbroken with 3.0 redsnow
and help.benm.at IPCC tethering app

Every so often my connection fails(internet, gps, apps) when I have all bars and a 3g connection. Sometimes when I reboot it starts to work again, but not always.

Does anyone have a clue on why it keeps going in and out all the time? or have the same problem?