Looks like the webhost (HostGator) issued a temporary ban due to overuse of shared resources: https://www.blogtechtips.com/2016/02/05/hostgator-temporary-block-has-been-placed-on-database-access-fix/
Site Owner needs to contact the host to get things resolved.
It looks like probably the attention from the recent HelloGreedo post has cause the traffic to spike outside the TOS.