Surface Pro 4 WLAN (wifi) issues

[AlbanRampon]

Hello,

Windows will change the "metrics" (=priority) based on link type, quality and others.
That's why putting the Ethernet adapter at a very high metric can ensure it's never tried because it is too costly.
DisplayLink driver does not change priority, altitude, metrics or any other adapter settings: it cannot do that.

There is a MAC address cloning feature which is used for enterprise. Because many companies seem to use MAC address filtering to whitelist their devices, the dock has to pass-through the host MAC address as whitelisting the dock MAC address would allow any device to access the network... and is therefore not desired by network admins.
The driver doesn't change the other adapter MAC address or settings, but it could be worth looking at the MAC address for the two adapters when the issue is present to work out if the system gets confused.
Sometimes the router/routing can be confused when not set properly: if you use the MAC address wired somewhere and then wirelessly but the two networks are not in the same range and the IP address lease hasn't expired, an IP address which doesn't belong can stick.

The logs gathered as explained in the third link of my signature when you have the issue would allow to look at what is taking place.

Kind regards,
Alban