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I found myself having the exact problem too. But in my case, it worked before ( the combination of volume down and power button) and suddenly it doesn anymore.
Then i realized even holding the power button wont bring out the shut down option so i hard reset the phone.
The screen capture feature works again after that.
I am having the exact same problem with my xperia SP as well. The power+volume down button only works for a brief while. Subsequently whenever i try to do the button combo, it doesn't work anymore until i hard reset the phone again. What i mean by not working is the phone goes silent mode after u press the combo. And when i press the power button only, the phone screen goes blank straight without showing the option of switching off the phone. Its freaking irritating.
If Sony is seeing this i hope you will rectify this issue ASAP.
does not work