Windows 7, 64 bit

I am new to Word 2013 but not to Word itself. I can save a document with no problem, but when I "Save As" with a new name, the program crashes about every 10th time. And when that happens, all I get is blank page for the new save. Of course I still have the original, but as I am writing a book with 170 pages, I am a little frightened as to why this is happening.

This does not happen with the old Word, I think around 2008 vintage or so.

The Word 2013 is a University (education) version.