My Thunderbolt is in 1G 75% of the time. I've tried LTE On/Off app. I've tried Juice Defender. Turning 4G on, turning it off (CDMA Auto PRL). NOTHING WORKS!!! Please help! I just don't get it! If 4G is unavailable- fine! But WHY does it automatically drop to 1G?! Why not 3G???.