Problem using Mac & PC at the Same time

I wonder if anyone could help me. I seem to be having an issue with my My Cloud Mirror.
If I have my PC on , and then try to connect to the drive on my MacBook , I get an error saying there was a problem connecting to drive. 

Everything is fine if the PC is turned off, and my MacBook is on, I can connect to the Drive.

The PC is connected to my network via a Ethernet Cable

The MacBook is connected via Wi-Fi 

If anyone has any suggestions, I would be grateful

Hello MickEP63, have you tried resetting the My Book Live? 

Thanks for the reply,

Yes Reset it a couple times, but still getting the same issue.