Problem
Every day you get signed out of any installed Office365 application.
Solution
The State Department/Microsoft recently reduced the MFA session timeout to one day for the Risky Users and Risky Signins policy. If you have to sign in every day then your account is currently in one of the Risky groups in Office365. You can reset your risk categorization by changing your password and then it will allow for longer MFA sessions.
You will need to login to Webtop to change your Office365 password.