Music played with the music app sounds fine, but I use the app Relax and Sleep (an ambient noise machine) and there is a pop in the audio every 5 seconds. I've tried several different versions of the app and they all do it. It did it before I rooted and after. It's a problem because I use the constant "Hum of Air Conditioner" to drown out other sounds so I can sleep, but the pops are so abrupt that it freaks me out. I read complaints of Netflix doing something similar, but an update fixed the issue. Does anyone have this problem in any audio app or know why it happens?