Update: Neither removing SD-card nor sfos_upgrade helped. When I have more time, I will check journald.
It looks like I just unite many problems that occur to other users, too:
REPRODUCIBILITY (% or how often): second time so far
BUILD ID = OS VERSION (Settings > About product): 4.0.1.48
HARDWARE (XA2, Xperia 10…): Xperia 10
UI LANGUAGE: Slovenian
REGRESSION: (compared to previous public release: Yes, No, ?): Yes (compared to v3)
This no audio and microphone during incoming call has bee aroud for some time not an issue of 4.2 or 4.3 releases only. I have been suffering from it on XA2 earlier too. A sw bug for sure…
And this is new:
REPRODUCIBILITY: 100% After some time
OS VERSION: 4.4.0.64
HARDWARE: XPERIA 10 III
UI LANGUAGE: FRENCH
After every reboot, you cannot be sure what will work this time and how long. Sometimes everything is fine, 10 minutes later the fails begin.