I had a similar issue with the .IM domain three months ago. One of the four NS for the domain was not responding.
Two of the guys at Cloudflare diagnosed it for me: https://twitter.com/xxdesmus/status/855858441289572353
Two of the guys at Cloudflare diagnosed it for me: https://twitter.com/xxdesmus/status/855858441289572353
JA.NET is the Joint Academic Network, the university / academic Internet infrastructure for the UK.
The CEO is active on HN too. Great customer service.
Personally, I run a script that emails me for every HN comment that mentions Cloudflare and use Tweetdeck to monitor @cloudflare/cloudflare mentions.