phone's about 1 week old, and i'm experiencing data connectivity issue. Sometime after unlocking screen and trying to use data it is not connected. The screen data connection would show 4G/3G, but the download and upload arrows are not blinking and there's no mobile data connection. Check email it said no connection, try to use banking app doesn't connect, open browser and it is connecting. However, if I activate/turn on flight mode then turn it off, mobile data is connected again. It does not work if I turn off and then on Mobile data, only works using the flight mode 'method.' What's going one???