I have an LG V20 and the same thing happen to my phone. Battery and when I use the 4G for surfing I get no connection or very slow (When it has full bars). Is it possible to go back to Nougat. I loved my phone when it was on Nougat.
I did the update to Oreo for my LG V20 (T-Mobile) and my battery drains faster than before. Has anyone experience the same issue? If you found solution please post.