Last couple of weeks we've been having issues users not being able to reach a .design domain. We tracked down the issue to the google public dns servers failing to resolve it with a SERVFAIL status.
After some research this might be caused by an issue with the top level name sever y.nic.design that is apparently not responding to TCP connections 50-80% of the time according to
https://dnsviz.net but it could well be something completely different?
The issue seems to affect many (or maybe all?) .design domains I've tested, for example
All on different hosts and nameservers. The issue as far as I can tell seems to be specific to the google dns servers. The domains still resolve fine using other DNS servers.
Do any of you know what the cause of this might be or how to resolve it?