Phantom 108DB Ethernet Link Speed

[ragwo]

I now have my new Phantom working on both Wifi and Ethernet and can now swap between them with no problem, at least when using Roon anyway. I factory reset it and unplugged the Ethernet cable and it then gave the option to set it up as Wifi. Once this is done, plugging the network cable in gives it priority and it automatically takes over as I can see the IP address change in Roon. If I then unplug the cable it switches itself back to Wifi. There is no way to re-configure it once setup so any Wifi name or password changes would mean a factory reset and re-configuration, but as a current workaround it works.

Devialet have 'taken note' my complaint about the missing network interfaces menu, whatever that means! 

Glad to hear that you've found a solution! 
I believe you can change the WiFi settings if you access the configuration menu via a browser. Enter the speaker's ip-address in your browser and select the network menu.