Unit Pages disappearing after a day or so


I am having an issue where my teachers will add unit pages to their course, and then the unit pages will disappear after a few days. Teachers are not deleting their courses, it happens unpredictably and I can't always replicate the issue, however it is happening to multiple users intermittently for the past couple weeks.

I believe it is similar to the issue being experienced here: https://premium.wpmudev.org/forums/topic/help-course-unit-pages-disappeared

I have already granted support access. Let me know if you need anything else.

Thanks for your help,