Is anyone else having problems with 4G connectivity? I have been keeping my RAZR in CDMA mode, but when I switch to CDMA/LTE in a 4G area I lose all connection to 3G and 4G, and my service even drops way down. I've tried switching airplane mode on and off, and rebooting but nothing seems to fix it. Is this a problem with the network or could I just have a lemon phone?