Autocorrect Performance Issues

HelloProwumpus 

welcome to the Microsoft community, My name is Recep I'll be happy to help you today.
I understand that you are experiencing a decline in the performance of the autocorrect function in Teams.

It can be because the autocorrect dictionary is set up incorrectly. You might attempt the following steps to address the problem: 

1. Launch Microsoft Teams, then select your profile photo. 
2. From the drop-down menu, choose "Settings." 
3. Choose "General" from the left-side panel of the Settings menu. 
4. You can access the "Typing" section by scrolling down. 
5. Turn off autocorrect for misspelled words by toggling the switch next to it. 

You might need to clear the autocorrect dictionary if disabling the option doesn't fix the problem. How to do it: 

1. Launch Microsoft Teams, then select your profile photo. 
2. From the drop-down menu, choose "Settings." 
3. Choose "General" from the left-side panel of the Settings menu. 
4. You can access the "Typing" section by scrolling down. 
5. The "Clear autocorrect dictionary" link should be clicked. 

Please let me know if this doesn't work or if you need further assistance.