A family of Microsoft word processing software products for creating web, email, and print documents.
Segunfunmi appears to have got the wrong end of the stick. I suspect your issue is just a matter of Word needing to repaginate (in essence, recalculate and redraw the pages). Endnotes exist in a kind of virtual space that creates complexity for Word and slows down repagination. What you can do when using such a document is press Ctrl+End when you open the document. This forces Word to repaginate the entire document to begin with instead of piece-by-piece as you go through it. You may find that this clears the problem of disappearing notes.