I've also noticed that, if I lose LTE and fall back to 3G, my phone is reluctant to reconnect to LTE if I've moved to where I know it's available. I usually have to toggle data off/on, then it's the eHRPD without data until it reverts to EVDO after a min or two. (Boy, do I still miss having the Reset Mobile Connection button function in SCP! - *looking at you, Google*)
I'm hoping this will improve with optimization, resetting switching, or whatever with time.
Sent from my HTC One M9 on Tapatalk