Patrick I hope this has worked for you and is fixed already, but anyone else reading this, the quick fix seems to match up with what Windows users have learned a long time ago. "When in doubt, restart."
Except in this case, it's not just powering down your phone. You need to press and hold the home button and power button at the exact same time (like you're about to take a screenshot, except don't let go right away) and keep holding it for approximately 10 seconds. At that point your screen will go black. Wait a few seconds, press and hold the power button and the phone will power up again. This is considered a "hard restart". It fixed the problem immediately on my phone. For reference, I have the iPhone 6s Plus.
Good luck everyone. And PS... It's a good idea to do a hard restart every few months or so. It clears up any excess data, or cookies left behind by all the apps or websites, etc. I learned this trick from a friend of mine's son who works at the Apple Store. I had a problem with the iPad it froze up and wouldn't start up, from the powered down state, I pressed and held the home and power buttons at the same time, and it worked. This is something that unfortunately we don't all know about.