iPhone 6s volume issue help needed

  KateB97 20:36 24 Dec 2017

My iPhone 6s is randomly tuning itself down. The grey square that appears when adjusting the volume randomly pops up on my screen when the buttons aren’t getting touched. I can sometimes make it disappear when in certain apps on my phone or when I physically turn the volume up. It doesn’t take long for it to show back up and is normally a few seconds. I have tried restarting my phone etc but nothing seems to work. Any advice?

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