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Then its a third party app that's causing this, which app? you will have to find which app that you downloaded its causing this.
unlock the phone > press and hold power > release the button > you should see the option
check this out
http://talk.sonymobile.com/t5/Software-Updates/Lollipop-New-Features/m-p/955490#U955490
Then its a third party app that's causing this, which app? you will have to find which app that you downloaded its causing this.