Default g2 from AT&T to T-mobile, won't connect automatically to LTE

HI, I just switched from AT&T to T-mobile. Everything basically works, except when I restart the phone, it connects to 4G only without LTE. Likewise when moving out of wifi range to LTE, i get 4G. However, if I go to Networks Operators and "Search Automatically," it connects to LTE immediately. Is there way I can get it to connect to LTE every time? I live in a area with excellent LTE coverage and I don't wan to have to constantly go and manually do the search for networks.... Thanks!