The app needs to manually be reconnected after a while of inactivity. My S9 stays connected indefinitely after I fixed it, but there's no information about the newer phone using Android 12. Any help would be appreciated.
Make sure the mobile device and the Roku player are connected to the same WiFi network. We recommend that you try restarting your wireless network, and then rebooting both your device and mobile app. For other troubleshooting steps that would guide you connect the Roku Mobile app to your device, you may check this How to connect the Roku mobile app to your Roku device over Wi-Fi
Appreciate your reply. What I am really looking for is how to create a sleep exclusion on the S22 for specific applications. It would probably be better off searching for that term on Google, but I thought I would try here first to see if anyone else had the same issue on the same phone I am using.