by Nobbie » 04. August 2018 17:59
Maybe (i definitalely do not KNOW, its only a CLUE) mediawiki puts some cache files somewhere, which are loaded in some cases instead of rendering a new page. And maybe these cache files are deleted either by mediawiki himself, or by any cleaning tool or whatever, if there is a longer break.
Dont know, but its the only option that comes to my mind.