Hi Flood,
Thanks for the quick response.
The phone is a Samsung Galaxy s10+ and is running Android 11.
The screen is being locked by pressing the phone's physical lock/on-off button on the right hand side of the device. The "Available on blocked device" checkbox is ticked for the apps in question, and they show as apps on the KSK overlay, and open fine. But when the screen is locked, the playback is stopped.
Is this usual behaviour of KSK?
Thanks