Strange behaviour
There is something strange with this app. The background sound turned on in the middle of the night without any action from my side. We were sleeping at that time. Firstly it happened on iPhone and then the same repeated on iPad. And not only that, the app wasn’t even running, i.e. it wasn’t in app tray. I closed all the apps and sound remained playing. I’m not joking. That behaviour seems very unusual for an iOS app and scared us a little. Maybe there is a bug in iOS as well, please check it out. I have no description of reproduction. It happened suddenly when devices are just laying on the table. One more detail: when I noticed sound on iPad, your app was completely closed (couldn’t find it tray) but when I opened it and then closed, the sound gone. That why I think the source of sound is this app.