I have the same/similar problem, after updating to HC 3.2 OTA any music app I've tried has stopped after I've either pressed the lock screen button or it has timed out. The only difference between music apps is the amount of time it takes before it stops.
Stock Android music usually lasts until the end of the first or second song.
Hive Player lasts about 5 seconds.
Nemo (Acer) works about the same as the stock Android one.
It may have done this while on HC 3.1, I don't recall.
All other forum posts seem to relate to automatic task killers terminating the process to save power.
Also tried factory reseting, still no good