https://arstechnica.com/gadgets/2017/11/apples-fix-for-peculiar-ios-autocorrect-issue-may-come-as-soon-as-this-week/

In the past few days, some iPhone, iPad, and iPod Touch users reported a bug that autocorrects the single letter "i" to either "A," an exclamation point, or a symbol that resembles a question mark in a box. While the bug doesn't appear to affect all users, it's widespread enough for Apple to be working on a fix for it. According to a report by The Wall Street Journal, Apple plans to fix the problem in forthcoming iOS beta and public releases that should come sometime this week.