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Hi @01007614636
Please, boot your device into safe mode as explained here. If this issue is not present in this mode, that indicates a third party app is causing the problem. In this case exit Safe Mode and then un-install any third party apps you don't need and clear the cache/data for the apps you want to keep. I´m at disposal for any question.
reinstall lollipop with PCC and report back
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355