Accessing WD MyCloud With Mac when Windows Computer is using it

I have a WD My Cloud which I access through finder on the Mac. Two other people need to access it simultaneously, both using windows laptops.

One of them poses no issue - they connect, I connect, everyone is happy.

The other one (the newer laptop), is causing a major issue. Whenever that computer is on and accessing the My Cloud, my connection is broken and the Mac cannot map the server. I can’t get on at all.

This is an impossible situation - anyone go any ideas about how to fix it?

It sounds like an issue with the network itself. Are you certain the new computer is not using an IP configuration that conflicts with your Mac?

No, I’m not certain about that! I can access the internet fine at all times though, and get onto the My Cloud ok via the app.

How can I check this?