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Really missing volume settings
haven't been able to recreate this, check which apps you are using/have open whenever this occur.
This exact same problem was an issue that was in the Xperia Concept firmware for the Z3, so I am quite suprised it has passed to the official firmware release.
There is no conflicting software it is purely an issue that Sony have to resolve the same way they did in the Concept.
There is another bug with sound controls.
Sometimes when you press volume up or down buttons, arrow is missing for additional sound settings:
@almirsahbaz Never happened to me and some other people have tried and still couldn't replicate.
Here is video proof of bug on my phone, only restarting the phone fixes this problem: https://drive.google.com/file/d/0B1eA4NplleSjZEZCMmN4cEx6SFE/view?usp=sharing
And here is another user post on xda-developers forum with the same bug: http://forum.xda-developers.com/showpost.php?p=65820963&postcount=144
Edit: Someone already reported this bug, but you discarded this issue: http://talk.sonymobile.com/t5/Xperia-Z5-Z5-Compact-Z5-Premium/Missing-volume-settings-6-0/m-p/110190...
This is only happening after not using my phone for longer periods, for example overnight.
@almirsahbaz I haven't discarded anything, the user hasn't replied. That might be related to a 3rd party theme applied.