I might get some guff for this being a day late so to speak but I've already discussed this with many of you over the years. Every year in September, Apple releases new versions of their operating systems. This year it was iOS 10 for iPhones & iPads and Mac OS Sierra 10.12 for Mac desktops and laptops. As a general rule it's never a good idea to upgrade right when these are released because there will always be bugs. It usually takes a few months and a couple updates for them to iron out those bugs. So let everyone else play guinea pig for a few months and give yourself the Christmas present of a stable updatedupgrade for your device.
In case you've already made the plunge, here are some articles to fix some common issues with these upgrades.
10 Common iOS 10 Problems & How to Fix Them
12 Common macOS Sierra problems & Fixes