Writing Books - Up, Down, Up, Down

That's really strange. I have never experienced this. I wonder if it has anything to do with the fun level of the computer versus the bookshelf and the comfort level of what they're sitting on? Maybe check and see if your bookcase fun level is higher than your computer. I use the level 10 computer and have the high level bookcase right in between them as they write and they never get the books. I also always set my sims to exactly the mood they need for the book. So for example, I put them in an energized mood if they are writing a sports skill book, or a confident mood if they are writing a motivational book. For normal books, you could try putting them in an "Inspired," mood and see if that helps them keep on track.

I've had my super sims continuously sit through writing an entire book start to finish for hours and they've never gotten up once. Even with additional commands for them to drink their plasma packs, they finish their books first unless I stop them.