The server for account "Yahoo" returned the error "[SERVERBUG] AUTHENTICATE Unable to open mailbox; please try again later." Your username/password or security settings may be incorrect. Would you like to try re-entering your password?

When I re-enter my password, I always tick the box to "remember the password in the keychain".

Then Outlook connects but disconnects after a while. 

In general, the account is always disconnected after a long period of inactivity (say overnight).

Any tips?

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