It's amazing how often finding the obvious cause of a problem only mitigates it, and you end up having to solve it 2 or 3 more times in the following weeks. In

It's amazing how often finding the obvious cause of a problem only mitigates it, and you end up having to solve it 2 or 3 more times in the following weeks. In this case, there were NUMEROUS suboptimal or misconfigurations of DNS but none of them mattered until the volume reached a tipping point, and, suddenly, ALL of them came into play. Fixing one overflowed into the next, which overflowed into the next.