Hi @Mike_1960,
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.
Also, can you please confirm if this issue occurs on your Core’s “System Output” or HDMI zone or if logging out of Qobuz and back in helps?