Kernel updates to install a newly released security fix will force all servers to be rebooted.
206.212.253.34 is already completed. The others will be done in the evening of May 13. It can be done remotely but I would rather do it in person. The downtime should be a few minutes each.
Also cpanel was just updated to fix it's own
security flaw.
Also
Roundcube webmail client is in the cPanel added feature path, and will soon show up in cpanel. This will give domains a third choice in webmail clients (Squirrelmail, Horde, and Roundcube). It has been installed on one server for about a month (206.212.253.84) and hasn't had any problems.