Do you have many “old” cPanel servers? Perhaps you have the cpanel servers configured in a DNS cluster for redudancy? If so, you may encounter the same problem as I did where you have “stale” (or old) DNS zones cluttering up the server. Here’s a script to get rid of any unused zone files (use at your own risk yadda yadda yadda – you will have to rebuild /etc/named.conf afterwards):