Sure! As per my clients IT guy:
I’ve narrowed down the cause of the issue. WordPress search for a temp cache that is normally blocked by caching plugins. I disabled all caching in the server and all caching plugins on the site which is what fixed it last time. But I am going to add an exception into the functions file to prevent this from happening again with or without caching.
This seems to be a common problem on wordpress sites with cache plugins. Hope this helps.