My Droid Turbo keeps switching to 3G. My coworker who sits next to me has full bars of 4G, yet my phone seems to switch to 3G and then stay there. If I restart, it will go to 4G for an hour or two but then switch again. I did a factory reset, tried global, LTE/CDMA and LTE/GSM/UMTS cellular networks. I don't want to go to the Verizon store and have service hand me another phone, I would prefer to fix mine.