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I have upgraded my android 4.0.3 to 4.04 (Build 4.1.B.0.431). I am getting pattern problem from there onwards. My pattern is jumping first 2 or 3 times. Next pattern is drawing correctly. Is the problem with touch or android ?
that's odd you could repair your phone with
Update Service (SUS)
http://www.sonymobile.com/gb/tools/update-service/
http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
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you could test your touchscreen
Service Menu
http://talk.sonymobile.com/message/113787
Don't forget to mark the Correct Answers & Helpful Answers