Having intermittent problems with headphones on my iPhone 6s. I might be listening to music, a call comes in and I accept (using headphone control) but I can't hear the caller and they can't hear me. Sometimes it's resolved by plug the headphones out/in. Sometimes not. Same for music sometimes it plays but sometimes I can't hear and the same plug out/in routine works. Sometimes I plug in I can hear audible click or signal detection (it's connecting live) in the headphones but no iOS output sound, plug out/in again and it might work. These are some of the overlapping scenarios. I have not tested it with another set of headphones as I don't have any to hand. I did think it initially hardware i.e. the jack was faulty or maybe the headphones but now I'm not so sure it seems more a software bug and it's only surfaced in the last two weeks. Never had an issue before. Appreciate any insight on the matter from the millions of users out there!