ok, could you, please write what did you do?
my problem is sort of similar, during the conversation people I talk with can sometimes hear me, sometimes not. it's usually really quiet. any help would be approciated!
I had the same problem with my Z3 compact and after searching allover the internet I found the solution to my mute calls: go to Google settings > Now > Voice > Ok Google detection > turn off 'from any screen'. Now you can't speak from any screen 'ok Google' but the microphone will work in the right way during calls