Dear Friends. I have a very strange Iphone 7 microphone issue. When answering a call normally everything works fine. If i switch to loudspeaker the following thing happens : The caller can not hear me while he is speaking. It’s like a one way conversation until he stops talking. Then he gets audio from me again. I tested extensively and all 4 mics work on my Iphone 7 the loudspeaker also works fine. ( I covered each of the 4 mics and talked into them while recording video front and rear camera, voice memo, even while using facetime ) All mics work independently , they just can’t work together to cancel the speaker sound and capture my voice at the same time. The phone went thru IOS 12-13-14. Also did DFU mode reset. Enabled/Disabled Noise Cancellation. Nothing helped. Did you see anything similar until now ? Every shop i took it to is baffled by this behaviour. Strangely I also have a Iphone 6S doing this. Thank you in advance.