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I am sorry to hear this. You could try to perform a software repair or just downgrade to 4.4.4.
reinstall lollipop with PCC and keep an eye on which apps are causing this (background apps)
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Just repair your phone and report back.
This happened to me like,an hour ago? The battery wasnt hot at all, i wasnt using my phone for a few hours, but then i listened to some music and it shut down within a few minutes. It wouldnt switch back on until i held the on/off button and pressed the volume button.Such a pain..But,what bothers me is that it says that Android OS has consumed 56% of my battery?
Im starting to hate the lollipop upgrade
Still same when I repair and I cek battery status is overheat but device not hot..please help me.