We have seen a situation happen several times in the last two months where customers using a particular ISP (CenturyLink in the Denver metro area) are unable to resolve one of our hostnames for typically 30-60 minutes at a time. They see an "Unable to resolve host" error message.
Customers outside of CenturyLink are not affected during this time, so I strongly suspect it is a CenturyLink issue, but I am wondering if there is something specific we can do on the GoDaddy DNS side to help. Would changing our default nameservers help? Is there any sort of a resync or refresh that we can initiate (or request) that would update both GoDaddy nameservers as well as downstream DNS caches? What about changing the TTL (currently set to 1 hour)?
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