I recently came across a strange wordpress issue wherein the media library did not load and multiple calls were being made by the CMS to admin-ajax.php. Now the load of the server was rising as well as these calls seemed to be fruitless. Quite confident that someone somewhere would have resolved the issue , I began my search only to find numerous closed posts on the Wordpress.org forum and unanswered questions on Stackoverflow.
I took a deep dive first understanding the nature of the issue and to my surprise the issue had something to do with moving the wordpress site from one domain or server to another in most cases. The second bug was that although you restored from backup the issue wouldn't go away. Most of these installations were quite large in terms of number of posts and something as naive as WP Clone was not suitable. I call WP Clone naive in comparison to Joomla's Akeeba backup and clone manager.(Joomla's got its own Santa's)