I’m having this issue also. The Roon app, acting as remote, makes my iPhone 12 Pro heat up like an oven and burns battery.
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 there a support email I can use rather than posting publicly?