Always, as a last resort, perform a factory reset if problems persist. This can often clear things up. You can also go into your Verizon store, politely and nicely ask for them to replace your 4G SIM card. Quit beating up those sales reps! Something like over 50% of phones returned and exchanged have no trouble phone. I am sure they hear 'my phone reboots. Oh, how many times? 2 times.... I need a phone that works! I want a new phone.' And it's just an anomaly that happens to all these devices, Android and iPhone.