I'm sure I didn't dream this. I was playing a track in ST3 earlier and the screen went black (the track continued playing). I thought ST stayed awake by default? Is there a setting just for the app? I have set the whole iPad to stay awake for now.
Disable Screen Lock set to ON
Correct. See here: https://stagetraxx.com/user-guide/settings/#disable-screen-lock
Many thanks. I still wonder what changed the setting as I never normally let the screen sleep when in ST but no matter. Glad it happened at home and not in front of an audience.