A Page Randomly Become Invisible

Hello auliasa ,

I've seen cases like this before, usually with corrupted documents.

Try this: 

Stay in the Draft view and go to Find and Replace and search for section breaks. Once the search comes to the trouble ones, hit Replace (leave the Replace with field empty). I suspect you might actually need to delete all section breaks and reinsert them afterwards. 

Better yet: once you've replaced all section breaks, select the entire text without the last paragraph mark, copy it and paste it into a new document and reinsert the section breaks there. Get rid of the current document, as it may very well be a corrupted file.

Let me know if this works. If not, we'll try something else.

Regards,

Lenka