Hi @Andrew_Woodfine,
So we can better assist you, please provide a brief description of your current setup using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.
Is your Core connected via WiFi or just the endpoint? Is this happening for all endpoints?
Are you referring to the volume level of the Naim device jumping to 100%?