Thanks for taking the time to write in! Sorry to hear you’re running into scrolling issues on your Roon remote!
Do you experience this on Arc as well?
First, try clearing your cache and rebooting your mobile device. If your issue persists, I would suggest removing and reinstalling Roon. I would also check your router settings (what model are you currently using?) and make sure to disable “Enable Multicast Routing” for proper communication.