Along with the iPhones 8 and X, on September 19, 2017 Apple released iOS 11. While it was full of new features it seems it is also full of bugs.
Apple quickly released 11.0.1 to fix a problem that Outlook/Exchange users couldn't send e-mail. It also contained other "bug fixes and improvements."
Apparently not enough.
On October 3, 2017 Apple released 11.0.2 to fix problems with iPhone 8 and iPhone 8 Plus users hearing a crackling sound during phone and FaceTime calls.
Now Apple has released a beta of iOS 11.1.
A word to the wise, avoid iOS 11.0.x like the plague.
If you're already getting nagged to upgrade here's some help.
Steve Jobs must be spinning in his grave.