I have tried all the available fixes including Airplane mode on and off, SIM card reset, and Verizon refreshing VLR but all were temporary. I called Verizon this morning and they stated to turn off Wi-fi completely. When you are not connected to wi-fi and it is searching for a wi-fi signal it interrupts the 4G service for some reason. I turned off Wi-fi several hours ago and have had no drops as of yet. Other people should try it and report back here!