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Can you try settings-apps-all-phone,force stop and clear data?
Nice to know.
Can you check if the same problem occurs in safe mode?
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008
Better try to boot your phone into safe mode and then check
or try to stop apps like facebook, messeging apps etc.
If you have any custome keyboards or input methods installed then try to remove them and then try.
In this case,you have a 3rd party app acting up.