domain suddenly doesn't resolve

[Simon Waters]

Gerald Waugh wrote:
> 
> I have a server that I tend ns0.hostshq.com
> Suddenly nonthing in the hostshq zone resolves
> hostshq.com

> Can anyone tell me what went wrong?
> They have been working

dig @a.gtld-servers.net hostshq.com ns +short
ns1.split-infinity.net.
ns.stedmundsbury.org.uk. 

dig @ns1.split-infinity.net hostshq.com ns +short
-- referred to .com servers --

dig @ns.stedmundsbury.org.uk hostshq.com ns +short
dig: Couldn't find server 'ns.stedmundsbury.org.uk': Name or
service not known

You have no working name servers?! We can't really delve back
into why you have no working name servers, you should have been
monitoring them routinely if you wanted to know when one of them
failed.