Hi Nadeen,
My name is Robert, an Independent Advisor and an expert user.
You perform a quick repair of your office as an initial troubleshooting step on this matter. Please see the community forum below for your reference:
https://answers.microsoft.com/en-us/msoffice/fo...
I hope the above information helps. Please let me know if you have further questions.
Other than that, have a great time ahead!
Sincerely,
Robert