I only started encountering this problem recently, as I have been a SoundCloud user for almost a year, both on mobile and desktop. The problem is, when I either turn of my phone or close the app when music is playing, the music fades away very quickly, and ultimately, stops playing. When the app is re-opened or the lock-screen is shown, the display is still running, which includes the music-timer and pause-button, as if it were still playing. From the lock-screen, when I press the pause-button, the timer stops, and a play-button appears, which when pressed, starts the song over again, and I can turn my phone off without the music stopping. This does not apply when the phone is unlocked, however, as the music will stop playing either way; by closing the app or having the screen turning off. Thank you to the developers of this app for all of their hard-work, and good luck to the engineers with this bug!