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Hello,
unfortunately I've got to add to the list another bug found in 4.2.2 update for Xperia Z 😕
I was listening to the music through bluetooth and my MW600 handset. The bug is:
- when you try to change the volume by the button in the phone (increase or decrease laudness) then the animation will pop-up, but the slider do not change its position. The volume laudness is changing, but if you try to increase / decrease it by a few "degrees" the animation is not showing the current change.
Please let e know if you are facing the issue as well and if it also happens for another paired by bluetooth devices...
Sony c'mon!!! 
In my opinion it seems that there are no too many testers working for Sony mobile and that may be the reason why the company is releasing such incomplete, full of bugs "updates".
Topic was edited by: Rickard
I've tested this but the slider moves for me. First try with the Walkman app if you're using a 3:rd party player and if the problem also happens with Walkman try this:
- remove headset from paired devices
- turn headset off
- hold on/off on headset for 10 sec.
- hold on/off and answer button at the same time until headset turns off
- turn on headset and add it back in your phone