My android security patch level says November 1, 2017; I don't know if the Dec build is out yet. Edit; just reset network settings and still stuck on 4G only; Rogers LTE APN is being used.
I have the same issue (no LTE); regular S7 W8 model stuck on 4G/HPSA. Not sure when it started exactly but it was within the last month. I received text messages from Rogers stating I would lose LTE if I didn't upgrade to android 7.0; even though ...