A family of Microsoft word processing software products for creating web, email, and print documents.
Intermittent problems are always difficult to troubleshoot!
If this occurs again, screenshots would be very helpful to us in helping you.
How to include a screenshot in your post here in the Microsoft Community
There may be more that you want to include in your question as well. Here are two resource article on how to get the best answers in this user-to-user support forum.