....check System Preferences > Network and see if your USB port is listed among the network ports and if so, try removing the USB port from the list of possible network ports....
I took a peek there and only saw:
• Bluetooth Pan (Not Connected)
• iPad USB (Not Connected)
• Wi-Fi (Off)
• Thunder something or other Bridge (Not Connected)
So, I figured, "not much to do here" and just left it alone.
