I have successfully been using Roon Remote on my Samsung Galaxy S7 Edge for a while. It has suddenly become very unresponsive, to the point it no longer works. I haven’t changed anything as far as I know, no upgrade, it takes about 30 seconds to respond when you press any controls, and the library doesn’t show. It is connected though … any ideas ??
Try rebooting the Roon Core to see if that helps.