Since update to S2, occasionally the volume on all connected devices will go up by itself. This seems to have an issue that happened in an earlier version of the software but came back.
It only happens when multiple devices are connected, and turns itself high to the max which is really unexpected and causes distress to my child. When clicking it back to normal volume, it goes up by itself to the max. This behaviour stops when the iOS app is restarted.
Please review your app and fix the bug.