Apple's had a shockingly bad week of software problems.
Many of our customers tried to question the fact that iOS 11 might have problems. It seemed to them that it was very easy for us or for other developers to blame for certain mistakes. Fortunately, or unfortunately, any cause for the cause is Apple's inattention. The past week has been outstanding in this respect.
It's a great article from VERGE's pen, please read it: https://www.theverge.com/2017/12/2/16727238/apple-macos-ios-software-problems-updates