Hi, we run a membership site on WordPress. This site has been up and active for a few years with no issues. The past couple of weeks we get client complaints that they can't access the site, with an error page that says "The page you tried to access does not exist on this server..."
After a lot of playing around I found that if I reset the permalinks, it fixes the problem. However I also discovered that this is a VERY temporary fix and that within a couple days or hours the exact same issue crops up again.
Does anyone have any ideas what could be causing this or if there is another fix besides the permalinks?