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I restored the software from bridge on mac, there's PC version as well. It worked, improved a lot. I don't know what was the problem but you can try to restore the system again.
you should try to find what eats your battery. Once found, kill it (or uninstall) and see what it changes.
this can help, a "small app", very handy:
https://play.google.com/store/apps/details?id=com.coolgiga.rttm
Hi karlok, suggest you software repair phone with PC Companion or Update Service.
http://www.sonymobile.com/gb/tools/pc-companion/
http://www.sonymobile.com/gb/tools/update-service/
Be aware that this process will erase phone data completely.
Once you are done with the software repair, be cautious of what apps you are going to install to your phone. Monitor if any of them is the culprit.
Don't forget to mark correct answer as Accepted Solution.
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