My friend, please explain you're question a bit more. It makes no sense (No offence)
I'm guessing that every time you restart the game/scene, you play music?
1. If you have background music in a scene, you must place that behavior (Music) in every scene you want music to be played.
2. If the music/Sounds cut out after a minute or two, it might be because you have a {Stop All Sounds} Block Or {Set volume} Block at 0%. When the times comes, it will remove all sound.
3. If you change scene, or restart the game/Pause. All sounds will be {Replayed}, they will stop and play again. (That's normal)
If you want a sound/music to play non' stop, just loop it.