In the last week, my Archer VR900 has behaved oddly. When wired PCs are connected to the router via LAN, the modem appears to develop a fault and the internet connection terminates.

To replicate, I ensure internet connection works and is stable.
I connect a computer via one of the four LAN ports.
Within 1 minute, the VDSL connection terminates. Logging into admin I receive an "Internal error" with Code 1.
I unplug all wired LAN connections and the VDSL connection is restored.

This issue does not affect WiFi connected devices. I have pluggedin Windows 10 PCs and Windows Server 2012 R2.

I have upgraded to the latest firmware as advised by a webchat support agent but the behaviour still manifests. :confused: