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.