why is my music keep going off as i listen to it

Not quite the details @awesomemac was hoping for.

This can happen if you have battery optimization enabled for the app, or if you're using a task killer, if there's a bug of some sort, or if you're streaming and you lose your data connection. 

If I was you, the first thing I'd do is I'd uninstall and reinstall the app.  You won't lose your music if you do this, although if you've downloaded any music for offline play you'll lose that when you uninstall and will have to download it again.  The rest of your library won't be affected.  I'd then check to see if the music still pauses.  If it doesn't, it's fixed.

If it still pauses, I'd check the app details and make sure under battery that I've not got battery optimization enabled for deezer.  I'd also check that there were no task killer apps on the phone.  If there were, they'd get uninstalled as they're unnecessary.

If it still pauses after that, I'd contact deezer support. The link is here → https://support.deezer.com/hc/en-gb

Good luck.