Deco M9 Plus keeps disabling Ethernet while WiFi continues to work normally.
I have 3 Deco 9 Plus v1.8 and 3 v2.8 added later for better coverage for my Wyze outside wifi cameras. I have about 80 devices on wifi, cameras, Alexa devices, printers, wifi lights and switches, and 3 or 4 PCs. During the last week the Deco 9 main router puck, which is an original v1.8 has been throwing our PCs off Ethernet. Almost everything but our laptops and a printer is on wifi, which continues to function fine when this happens...I am not losing internet, so it's not Xfinity or the modem. Just the Ethernet from the main router module gets disconnected. It happens randomly, sometimes one laptop, sometimes another, sometimes a desktop, sometimes both or all three. Rebooting the main router will most often allow Ethernet to reconnect, but sometimes it takes three or four cycles. Everything works well for awhile, then BOOM! It drops one or more Ethernet connected computers. Rebooting the computers avails nothing. The router has to be powered off then repowered. We are using wireless backhaul, and Ethernet goes from the Gigabit port on the main Deco to an 8-port witch, then to our PCs. It's not the switch. I've tried a new switch and I've also run straight from the router Deco to one laptop. Same result.
This is driving me nuts...any ideas? The system is about a year and a half old, and has been functioning flawlessly until this week. We like to use Ethernet for the PCs to keep wifi congestion down. I have Gigabit service from Xfinity, and when Ethernet is running, it delivers over 875gbps to the computers, which is about 3x the speed we get using wifi. The pucks do seem to run hot, and the cases aren't well vented, but it's strange wifi continues to work when Ethernet dumps.
Thanks for any help or ideas. I'd hate to think I have to junk the whole mess and start over.