You might want to check the user-agent string of your guests against Blocking aggressive Chinese crawlers/scrapers/bots
. There have been a number of discussions of this going back to last November.
On my boards I've implemented the update solution posted in https://www.johnlarge.co.uk/blocking-ag ... ment-11823
and that has resolved the problem.
Normal people… believe that if it ain’t broke, don’t fix it. Engineers believe that if it ain’t broke, it doesn’t have enough features yet. – Scott Adams