It's not a myth, I just renumbered my IP's, had 1 hour TTL on all records, and had 1/3 of my hosting customers complain that the site was unavailable for up to two days after the switch...
"Two days" is usually the key in a situation like this -- NS glue records for .com/.net have a 2 day TTL. So if your DNS servers were on IPs that were changed, it would account for this. This is one of the rare exceptions where DNS changes will take longer than they otherwise would, and where the delay is beyond your control.
... and they rebooted, cleared cache, used ipconfig /flushdns if available, and at 5 different dns checking sites, including DNSStuff.com, all was great with all problem domains within a couple of hours.
But, that doesn't sound like the case here.
I can't explain why that would have happened -- it definitely should not have.
-Scott
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