Thanks you.
You’ve already run through our standard troubleshooting steps to no avail and I don’t want to cause further disruption on your live site.
Would it be possible to create a test site where we can troubleshoot without impacting on your live site (this could simply be a fresh WordPress installation in a sub-directory) then install only The Events Calendar and Events Calendar PRO – and add a few test events – then see if the same issue occurs there?
If it does, then that would suggest there is perhaps some sort of problem relating to your hosting environment. If there is no problem, let’s start adding all of the same plugins that you have on your live site – and ultimately the same theme – and see if the problem kicks in then.
Sometimes we uncover conflicts this way even though they were missed initially.
Can we give that a go?