We found that your app uses a background mode but does not include functionality that requires that mode to run persistently. This behavior is not in comp
I had the same problem and where I was using the UIBackgroundModes key to play videos in background via Airplay. while Technical Q&A 1668, it is clearly mentioned like this
Important: The UIBackgroundModes audio key will also allow apps to stream media content in the background using AirPlay (see also Special Considerations for Video Media).