If the music automatically stops after the phone/tablet locks the screen, it is recommended:

1. Try restarting the device.

2. Use the built-in player to play it, or try changing other songs.

3. Check whether third-party lock screen software is installed and try to uninstall it.

4. Back up data (contacts, text messages, photos, etc.) and try to restore factory settings.

If the problem persists, it is recommended that you bring the machine, purchase invoice, and repair card to the local Samsung after-sales service center for testing.