RESOLVED: We have found and resolved the issue with the cache2.dnsresolvers.com
cache2.dnsresolvers.com is currently unresponsive. DNSresolvers.com is our public service recursive DNS service, it’s unicast but does no NXDOMAIN interception or typo “correction”.
cache1.dnsresolvers.com is functioning as expected.
The systems group is investigating.
All core easyDNS systems (DNS resolution, forwarding, email, etc) are unaffected and functioning normally.