I've started to pick this one apart but the going is slow.
Using the aforementioned example, starting a background audio track by adding a m3u8 entry to the permanent favorites xml file, the pressing the back button to navigate away results inan intereuption of the audio for a few seconds. While the audio does then return, the operation is not as intended, and different tan that of other WP 8.1 apps that are doing the same thing.
I have looked at a few obvious changes, like not communicating with the background as onsuspended even arrives, but the operation is the same as before.
Something else must be at work here. If you can duplicate the problem, any ideas for what it is?
This happens on the emulator, as well as on a real Lumia 1520 device.
Thx