When using the iOS app as a remote, after 30 seconds of listening, my phone will go to the Lock Screen.
If I then want to adjust the volume for example, I have to unlock it, and wait for Roon to re-connect (resulting in a UI rerender/flicker). So it’s just not a nice process.
In the past, I have used the NAIM iOS app, which had an option to keep the phone from locking whilst the app was in the foreground.
Hoping you can add this as a feature.