Luckily, I did not update my iPhone software to IOS 11.1, and therefore, my iPhone is not bugging me. This is one of the reasons why I like to wait for a few days and let Apple fix all the bugs each time there is a new IOS update. However, a lot of my friends did experience the auto-correct bug.
So, to help my friends, I looked to my old friend Google and found out that Apple has provided a temporary workaround until it fixes the bug. The workaround is that you can use Text Replacement feature. To create a new text replacement, go to Settings > General > Keyboard > Text Replacement. Next, click on the plus sign in the top right corner. Beside Phrase, type “I,” and beside Shortcut, type “i.” Tap Save in the top right.
Please use the Poll button to let me know if this fixed your bug!