DNS NS Failure? Help!

We've been having problems on and off with all our websites, and all our email addresses. When we did a test at http://www.dnsreport.com it came back with this error:

"A timeout occurred getting the NS records from your nameservers! None of your nameservers responded fast enough. They are probably down or unreachable. I can't continue since your nameservers aren't responding."

Can anyone explain what this means? We are resellers using our own nameservers. What could have caused this?

Thanks in advance...DNS NS Failure? Help!

 

 

 

 

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