Thanks for the reply, yes its plugged into the nodes WAN port. The system had been working flawlessly for around a year until a month or so ago. It also didnt align around any firmware updates either...
I have my Wan plugged into a RT-AX88U Router, on latest firmware set to managing two ZenWifi AX AI mesh nodes (on latest firmware) wired and configured to use wired backhaul.
Intermittently (not daily but a 1/2 days worth of issues that go away for a few weeks and reoccur) these nodes drop...