I got my iPhone 7 Plus (AT&T, jet black, 256 GB) almost two weeks ago on Monday, September 19th. I have not had any of the issues that have come up and I've been greatly enjoying my new phone. Until yesterday... I went with a friend to Chicago for a concert and I was eager to record some video of the concert. Everything seemed to go well until I came home later that day to view the recorded videos. To my dismay, the audio was almost inaudible, sounding very muffled (not distorted, just very very soft). Two things came to mind: either 1) I accidentally was covering up the microphone with my hand, or 2) the music was causing the iPhone's microphone to muffle somehow. It was not distortion, but sounded like the microphone was covered up. So I did a few tests... I recorded a few videos in my living room with just me talking while recording. When playing back the videos, every once in a while, the audio would just cut out and my voice would be barely audible. I could still hear it very faintly, but again very very soft. I tried this again while playing some music in the background from my Apple TV. Again, it cut out several different times. I purposefully made sure that I wasn't covering a microphone (I was holding the phone only from the side edges). Later on, my daughter was practicing her trumpet and I thought that would be another good opportunity to test it out. I shot about 6 consecutive videos of her playing and in every one, the audio cut out. Strangely, it seemed to cut out right when the sound got loud and would come back after she got done playing. So that's where I am. I'm not sure if the loud sounds are triggering in, if it's some kind of noise cancellation glitch or auto loudness reduction? I checked my videos prior to yesterday and don't hear any audio cutouts in those, but there's no loud sounds in them either. At this point, I'm thinking either 1) there's some kind of software glitch that is causing the microphone to mess up (I'm running 10.1 public beta), or 2) there's a hardware problem with the microphone that is causing it to short/cut out. Of course, I verified that it isn't the speakers during playback and that the cutting out is in the actual recording. Questions for you experts out there: 1) I determined that there's a microphone in the earpiece on the front of the phone, and if I cover that up, the audio gets muffled during recording, but not to the same degree as this glitch (and I made sure I wasn't covering that when doing my tests). Is that the only microphone that is used for audio recording when shooting video? Seems like there should be a microphone on the back side of the phone facing the subject? 2) Any suggestions aside from backing up and restoring the phone (which I'm in the process of doing right now)? I don't know whether I should try downgrading to the release version of iOS 10, but I like having the Portrait mode and I haven't seen anyone else with this particular problem. 3) Also, I was talking to my wife on the phone earlier today and she said I was cutting out during the call as well, though we were inside a building and I figured it might have just been a service issue. But now it makes me think maybe the mic was cutting out then as well. Thanks in advance for the help.