I am been working on a very large document( a book) which is now over 500 pages. I had to take a long break (6 months or so). Now that I am starting to work on the file again, after I have been working (and saving the file as I go) for an hour or so I get an error when I try to save the file that the file cannot be written to. And I lose whatever work I ad done since the last save. I have tried "Save As" with another name, which worked one time, but never again.
The file is saved to my local disk. All fonts and linked images are on the same local disk.
I have been able to re-open the file so far. One time I was asked to "recover" the file. But it is starting to feel dicey. I now make a point of saving my work every few minutes, then I close and re-open Publisher after about a half hour.
I am able to successfully export to pdf the entire document without any problems.
Why is this happening and how can I make it go away?
Thanks in advance!
My iMac is running Monterey 12.4.