iPhone 6 s black screen during a phone call.

  john bunyan 12:08 18 Feb 2017

My iPhone 6s - on Giff Gaff (O2) sometimes has a black screen during a phone call so I cannot hang up using the red button. I have to do a hard reset using home plus off button. Any ideas? I do have a screen protector; someone suggested it could be a proximity detector but I don't know what that is. Phone otherwise works ok.

  john bunyan 20:55 18 Feb 2017

Any views? Sometimes happens at random now, and hard reset more difficult. May take it on Monday to the repair man from whom I bought it.

  john bunyan 17:51 20 Feb 2017

The back light filter has been renewed and the phone is on test with me for a couple of days.

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