imessage autocorrect not working
I have an iPhone 6s and upgraded to iOS 10. The autocorrect feature iMessage is not working, but only for one conversation, one person. I have deleted the conversation and started a new one but it's still not working. Doesn't recognize errors or typos, doesn't suggest replacements or insert them automatically. And it's only for this one conversation. All others (iMessage and regular SMS) are working fine.
There also seems to be a slight flash of the screen whenever I enter the text field in this conversation. Any idea what
iPhone 6s, iOS 10