First thing to try is close ID, reopen, and then export.
If that doesn't work, can you export in chunks?
It did not help to close and reopen it.
Not sure what you mean with exporting in chunks but if you mean exporting page for page , so it didn't work either.
I think that i'll try to reduce the size of Illustrator files , but I 'm not sure what will be the optimum size for that In Design won't crush again.
Or maybe i should make the presentation in illustrator instead? It take some time to save pdf from illustrator when the original file is about 90mb, but still it works.