If you have two or more network adapters in your machine that are connected to a network, you might want to enable load balancing. This makes Windows distribute the networking and internet connections or sessions randomly among the multiple adapters.
Hive: HKEY_LOCAL_MACHINE
Key: SYSTEM\CurrentControlSet\Services\NetBT\Parameters
Value Name: RandomAdapter
DWORD Value: 0 = disabled, 1 = enabled
You should double-check that the WINS query responses are set to send all IPs. In other words, make sure the SingleResponse value in the same key is set to disabled.