Popping sound from speakers

My Idol 3 have a popping sound from speaker after 2-3 seconds after the music or the sound from it finished. With other words when the speakers shut down the power, sometimes (more then 50%) speakers pops. I notice that is more often in Youtube app or notification sound then in Poweramp app for example (remember: the pops sound i hear only after the sound stops, when playing music there is no problem) . The sound is not so powerfull but you can hear it if you are in a quiet room or if you put the phone closer to the ears. How about you guys? Is my phone defective? :confused:

Issue with Task Manager etc. popping up randomly

Having an issue that I'm pretty sure just started after the Lollipop update. You'll be doing something like playing a game and feel the Haptic vibration like a button is being pressed. At the same time the Task Manager randomly opens and closes. A restart resolves the issue for a bir but then ib commences again. Thoughts.....??