I have an indd book set up and when I try to export the book the file stops halway through. Thought it was getting hung up on some images, so replaced those. Document got hung up at another point after that. If I create the book in 2 sections the pdfs go through fine. But I need it to pdf as an entire document.
Moved from the Creative Cloud to the InDesign forum. They will be able to help you here.
You need to break up your indd book to multiple parts and perform binary isolation to
Figure out the problematic content and pages.
See Adobe Community: File Crashing on Output - printing/PDF/other, but in all probability there's nothing really wrong if it exports OK in chunks. It's just a case of inusfficient machine resources and you can combine the chunks in Acrobat Pro.