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Reinstall the latest update with PCC (clean update)
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
This has been discussed so many times,either wait for the next update or try what uli said.
Topic closed.
/t5/Xperia-Z1-Z1s/Z1-issues-after-5-0-update/td-p/968554/page/16