https://arstechnica.com/gadgets/2017/11/ios-11-1-1-is-here-it-fixes-the-autocorrect-bug-and-a-hey-siri-issue/

iPhone, iPad, and iPod touch users running iOS 11 have complained of a bug with autocorrect that converts the letter "i" into any number of things that are not in fact "i," such as the letter A or an exclamation point. A report earlier this week suggested that Apple would soon release an update to address the issue. Today, iOS 11.1.1 became available on supported devices, and it does just that.

The update also reportedly addresses a problem that could sometimes cause the "Hey Siri" command to stop functioning. Apple's update notes are as follows: