Pointer records not updating
We now accept dynamic updates of PTR records within our zones.
But even the most highly trained and savvy administrator can get in a hurry and make a mistake.
I liken it to the days when automobiles had carburetors; a mechanic could fix most engine performance problems by fiddling with the choke—spritz a little WD-40 into the throttle body, charge and retire in the suburbs after a few years. Check the TCP/IP settings, run a few utilities to verify the zone records, charge 0 (correcting for inflation) and retire to Arizona.