This is happening with me with a normal 3.5mm stereo cable connected to external speaker, Mixcloud will pause every couple of minutes without touching the phone. Extremely frustrating, I basically cannot use this phone to play on a speaker.
I have the same issue where Mixcloud will stop by itself every 8-10 mins when connected to a speaker with a normal cable, not being touched - very frustrating. It seems like the widget control / lock screen and app is out of sync.