What a morning.
Internet down.
But was it?
Modem reboot (X5).
No service-outage in the area.
Passive switch unplugged & replugged 2X.
Hardline computer into modem.
Hair falling out.
Wife bitter and missing meetings.
All now fixed. Magically.
I have no idea wtf was causing it.
Now I'm going to go down a rabbit hole to offload the routing and DHCP to a separate device. That may not have even been the problem.
Definition of insanity.....
@jurban Problems with no apparent cause which temporarily resolve themselves when you try to debug will drive you insane no matter what you (don't) do.