player does not stop when I remove lightning cable or off Bluetooth on iOS

Player does not stop when I remove lightning cable or off Bluetooth on iOS.

I am using iOS (iPhoneSE and iPadmini4).

Thoug in using earphone, removng from earphone jack stops plapyer, lightning cable or bluetooth removing don't stop. I must stop player manually.

I purchaced upgrade version in Applestore, but the situation does not change.