Open the IDML in InDesign Save the file as a new InDesign file with a new name See if the issue persists.
Try resetting your preferences: The easiest way to reset everything is to delete the InDesign preferences: as soon as InDesign starts to boot hold down Shift, Alt, Ctrl (and Apple/Cmd if working on a Macintosh). A dialog will appear asking to delete the InDesign Preferences, select 'Yes' on this dialog. Further info and instructions here if needed: https://helpx.adobe.com/in/indesign/kb/indesign-preferences-support-file-locations.html
If still not working
Try exporting 50% of the pages - say from page 1-50
Then try pages 51-100
Whatever side it fails on - say it doesn't export from 1-50 - try 1-25 -
You can then narrow down quite quickly what page is causing the failure.
Then you can track down the element on those page(s) that are causing the issue.