Multi-homed Development PC causes B4A-Bridge problem

My development PC has both LAN and Wireless adaptors, to the same router. The LAN adaptor has a fixed IP address of 192.168.1.11. The wireless adaptor has its IP address assigned by DHCP from the router - it's on an Infinite lease, so it's always 192.168.1.120. The phone's WiFi IP address is similarly router-DHCP assigned, it's always 192.168.1.121.
Unless I disable the PC's Lan adaptor, the B4A bridge connection is unreliable, in that although both the Basic4Android status bar, and the B4A-Bridge app indicate 'Connected', the .apk often - not always - fails to download.
Now that I know the solution (after much initial head-scratching!), it's no longer an issue, but I'm curious to know why this might be.

The IDE tries to connect to the device IP address. Windows is responsible for handling the actual network communication. The problem seems to be in a lower level.

You might want to change the adapters priority order. There is such an option in Windows 7.

Thanks for that. Makes sense - since we know that the connection is established, it's up to Windows (or the Router) to deliver the data correctly.