@Jimvac 

The Deco unit should automatically connect to the node where the connection is best, possibly the main node is better even though it is farther?

How are you verifying that the third floor node is connecting to the basement node?

Have you tried holding the reset on the third floor node and adding it back to your Deco network?

@Tony I verified using the app. It says signal source is office which is the basement Deco.

I have rebooted but did not hold reser button and reconnect. If you think that would be a solution I will try it. Thanks