Help!! I went to a concert last night and took some videos on my iPhone 6. When watching back later I realized there was absolutely no sound to all of those videos. All videos took before and after that had perfect audio, and the concert videos didn't sound muffled or anything... just mute. Please does anyone have any ideas about why this happened and if I can possibly get the sound back? I've pretty much given up all hope now but I still want to know if there is a way to fix it at all!