Starting from 28th June 2018 around GMT 23:00, my authoritative name server kim.ns.cloudflare.com did not respond to queries. I experienced this problem at 4 of my Internet uplinks in Hong Kong and 1 of my Azure VMs in Singapore. Host command returns this:
;; connection timed out; trying next origin
I could ping kim and get replies, however.
Do you get the same problem?