@Miaelb I'm so glad I was able to help get this file working for you and your virtual hug is received, thank you!
I've had overset text boxes do this to me before, not to where they crashed the program but to where I couldn't flow the rest of the type to another page. That's what was happening in your file but it didn't crash the program on me when I went to fix it. There are several things that could be the cause, including your local system, installation of InDesign, preference settings, and so on but sometimes these things just happen. I always make backup copies at each step of trying to fix something and work on the new file to try the next fix, such as clearing out or deleting all the blank pages past the last point of text and then seeing if the overset text will place correctly on new blank pages. I also used View > Show Structure to see there were a lot of tables at the end that weren't loading. Large, complex files like this can have problems, especially if content is cut-and-pasted instead of mapped. Setting up as a Book instead of a Document can be helpful, especially if other people need to work on secions of the project simultaneously, but I have worked on large books like this in one document without any problems. Sometimes, there is nothing to prevent what happens other than working to keep your file as clean and efficient as possible by removing unused styles, fonts, masters, swatches, and other imported artifacts. Make sure the preflight light is always on green once you get all text loaded. Also, make sure image files are in one folder and preferably in the same folder as the .indd files. You also want hyperlinks organized, named, and working correctly; delete any unused destinations and search through the panel for conflicts keeping the lights all green.
Now that the pages are all laid out, I think this file will be fine as you continue to make refinements. But keep saving backup copies at important stages and should any more problems arise, let us know. Enjoy!
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