Hope the 12.1.1 truly solves all the connectivity issues that some have been experiencing. For me, I couldn’t take it and moved on.
My 2 Maxes that I returned had issues with WIFI (connected fine but super short range), LTE (just overall terrible connectivity) and Bluetooth (with both headphones and car would have to be re-paired about 20-30% of the time). My old 6S Plus and my new X had/have none of these issues. When I tried to work with Apple, every time they acted all surprised like they never heard of issues before. What was funny was one of the people that I recently spoke to was the exact same one that I personally complained to regarding the first returned phone.
I’m not trying to be a sour puss, I do hope the updates fix the connectivity issues once and for all. I know how frustrating it was to go through the pains of a new phone(s) that doesn’t work as good as your 3 year old one.