Godaddy tries to upsell their "premium" DNS service by blocking high-frequency DNS requests on their non-premium authoritive servers.[1][2]

I would call that a technical issue, even though it probably only affects web crawlers.

1: https://news.ycombinator.com/item?id=2964084 2: http://rscott.org/dns/GoDaddy_Selective_DNS_Blackouts.htm