This happened when I tried sharing the folder with \"Everyone\". After the folder re-appeared it wasn't shared with everyone, but still had the same 2 admins assigned as before. I then created a group with a only 6 of the 7 users and shared it with that group. It didn't disappear and was shared pretty much instantly.
So it seems like while it is applying new permissions in your backend, it temporarily removes the folder. With a large folder it isn't so temporary. Definitely needs some looking into by your devs.
ps: I managed to chat with someone at Dropbox. 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