Apple Mail app not working with Yahoo! account

Now that I have the iPhone 7 plus and all new updates. I have been having problems with my yahoo mail not loading or updating in the iOS mail app. I have been looking into it for MONTH and no one has been helpful. I’ve even deleted the account to re-add the account multiple times and it fixes it for the night but messes up the very next day. I can sign into the email and it works fine on all other third-party apps and on Yahoo.com, this is an issue with the Apple Mail app.