I was writing inside a book and quill telling my adventures. Did not save the book for some time. After a few minutes the server kicked me because I was not moving for too long. I was still typing though.

When I relogged, my changes in the book had not been saved. That's around 10 pages I have to rewrite.

One of those three things has to happen in the fix : 

• Server doesn't kick you during book editing if you keep typing.
• Before you get kicked, your book gets saved as if you had clicked the "Done" button from the book and quill menu.
• Every new page created on the book and quill saves the book.