No internet on ethernet, wifi works

This happened suddenly this morning. Connections and internet were working fine until it didn't. This may have started shortly after I disconnected from my VPN, but I can't be sure.

Important: this behavior is happening on 2 ethernet connected PCs.
WiFi works fine on the laptops.

In Network Settings > Adapter settings there is a red X over my TAP-Windows Adapter v9 and on my VPN adapter.
The Local Area Connection adapter has no x.

Diagnostics say there is a network cable unplugged. Both PCs.
Network devices are all enabled in Device Manager.

I can ping all PCs and laptops. So the ethernet cable connection from PC to router is OK.

The router is a Trendnet TEW-827DRU.
I have restarted the router and the modem.
I have disconnected all ethernet cables and tested each PC one at a time.

I suspect the problem lies in the router. Otherwise why would 2 PCs have the same problem?
Looking for any help or possible tests or solutions.

OK, Internet is back.
I reset the router. Had to reconfigure all the settings. Everything working now. I think the reset did it.

Those 2 network adapters still have the red X on them. So is this normal? Do the TAP adapters on enable when you run the VPN or whatever Windows component uses the TAP-Windows Adapter v9?