When using the headphone output as a "line out" to an external speaker in an audio app, such as Winamp, Mixcloud or TuneIn Radio, as soon as that app loses screen focus, e.g. going back to the home screen, the audio level drops to almost inaudible. The only way to cure it that I have found is to unplug and replug the audio cable and make sure the music app remains in screen focus.
Checking the Volume Control, the Media Volume is not reset, and turning it up to the maximum 15, still results in very feeble audio.
Not using any effects in DSP Manager.
The problem is not repeated if using a set of headphones or the phone's internal speaker.
Has anyone any idea what is causing this behaviour - is it likely to be software or hardware based? Any ideas?