Microphone

[Cortoos]

Several times a day the microphone doesn't work. Than the phone as to be restarted. Latest version of software is installed. Even restart in safe modus doesn't work.

[Uliwooly]

@Cortoos

repair the phone with XC and test it 

settings > about phone > diagnostics > test > test mic

Xperia Companion (XC)

Software Repair Guide

Alternatives on How to backup Xperias

http://talk.sonymobile.com/thread/36355