@mikeyh, at our enterprise we use and advanced DNS feature from Infoblox called Sort Lists. It assures multiple A records for a specific DNS name are return in a certain order, according to the subnet those records are associated with and the source network of the DNS client behind the query. When those multiple A records end up in DNS Cache, local DNS resolver is not able to order them as expected, causing issues for our dev team. Therefore we need the Cache off.