WordPress 4.3 has a cron issue which may affect your sites.

There is a bug in WordPress 4.3 which can affect some sites causing high CPU loads and / or Database issues.

“Just spent a few hours debugging two sites which went down and tracked it down to wp_options cron exploding in size. There apparently is a bug in 4.3 which causes the cron to grow in size. This can cause all kinds of issues, particularly when the mysql packet size is reached.
The bug has been fixed, but won’t be released until 4.3.1. If you are experiencing issues, there is a solution here :
https://core.trac.wordpress.org/ticket/33423[1]”

For a quick way to transfer it to all of your client folders from within WHM, first install it onto a “donor” site, then SSH into your server, and run the following command – replacing codingconcepts with your donor user folder.  Activate from the dashboard and problem solved – or email your client to get them to activate it. This is a lot easier when you have MainWP installed on all of your client sites!

for i in cat /etc/trueuserdomains | cut -d: -d' ' -f2- ;do cp -r /home/codingconcepts/public_html/wp-content/plugins/wp33423-hotfix/* /home/$i/public_html/wp-content/plugins ;done