On right click on the tray icon it says:
Refresh NIC list (if I hit it, it twitches briefly, but nothing else seems to happen)
Remove the tray icon
Enable or disable start up launch
Launch (is not available because it is already running)
Exit
My amateur analysis is, given that the Wi-Fi connection is also malfunctioning, it would indeed be surprising if the issue were reduced only to the Ethernet connection.✌