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Settings > apps > all > smart connect > clear data > restart device
Do you experience the same on Safe Mode?
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
if you don't then its a third party app acting up.
Just give it a shot and try again.
I understand but if its going to solve the issue, then its worth it