Hello @Keith_Jackson, and thanks for your question! You should be able to reboot the Roon app without needing to reboot the core, but we’ll also need more information on how you’re set up.
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, are you still having issues with Qobuz?