We're aware that some servers produce MySQL error. It caused by recent MariaDB/cPanel update: https://forums.cpanel.net/threads/known-issues-status-page.644133/#post-2709945
For now we've disabled automatic software updates to prevent MySQL downtime. Few servers are affected (S1, DX and TIGER) so we ran MariaDB downgrade:
yum downgrade MariaDB-server MariaDB-common MariaDB-shared MariaDB-client MariaDB-compat MariaDB-devel
We do apologize for the inconvenience.