TO ALL READING HERE:
Ridley isolated the problem last night and worked around it.
It appears to be isolated to folks who use eero devices.
A verification build of PMS is being built now.
I will have links for folks ASAP.
The error can be verified by
dig plex.tv AAAA
If you get status=NOERROR then all is OK
If you get status=SERVFAIL then you are impacted.