Share your experience!
This issue has started occuring to me as well recently. The diagnostics microphone test does not even work, nothing is picked up whatsoever. Only a phone restart solves the issue..
Sir,
I am having sony z5 premium, First i had audio jack problem in my phone, i gave it to service centre and they took 22 days to change the phone . they gave me new phone i suppose. But now there is this basic problem of microphone. No one can hear me properly, i have to say 5-6 times , move phone and here and there so someone can hear me. i have tried everything, from forum on sony, from some other tech forums.
I hope you can solve this problem. Looking forward to your support.
thanks
I got exactly the same problem! This problem started a couple of weeks ago. The weird thing is that the problem occurs about 30 seconds into the call and sometimes fixes itself when i blow into the microphone..
Thing's I've tried:
Sony Tech couldn't fix it because they say there's nothing wrong with the phone. But they can hardly expect me to blow into the microphone every few minutes just to have a conversation over the telephone. Pls fix this!!
Be careful during the conversation not to touch or block the microphone hole which is situated next to the usb port. I've found when I'm holding my phone with my left hand, I accidentally block it with my finger so I can't be heard from the other side. So either hold it with your right hand or make sure you don't cover the hole. 
I can run the test mentioned on the first page fine in regular and and safe mode.
People cannot hear me when making calls in normal mode or safe mode.
I have never plugged in headphones to the phone ever.
I have not installed anything of my own choice since I first got the phone a few months ago. The only thing I get now are automatic updates.
I have restared phone and done a factory reset still to avail. Tests run fine in safe mode and normal mode.
I have removed the case even though the mic hole is not covered. No noticable difference in the tests with case on or off.
What else can I do?