I think that having a mobile device and moving about town a bit could cause drop outs or data loss. For example, lets say you are on the bus or train you are bound to change towers regularly, it might cause those error messages. Sometimes if I'm in the wrong building in the wrong corner I can't even get a GSM mobile signal. Wireless 3G isn't perfect with any network, I don't think it is just limited to Telstra. Mine is in my house and my PC and router stays put, that's probably why I don't have any issues. When there is heavy rain then that's another story, then everything claps out.