when i fly a away from my position the music just turns off 

I just tested and could not reproduce with the vanilla radio stations. Are you using a custom radio station or cassette tape?

ah yes i should have mention that sorry

https://umod.org/plugins/radio-station-manager

Sounds like a vanilla issue so not sure if there's much I can do. Can you test if it happens with a hand held boombox? If so, then we can report to FP.