Share your experience!
Do you have by any chance glove mode enabled?
Do you have a screen protector or not?
Strange,can you check if the same occurs in safe mode?
/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
Strange,you should have the device checked at a sony service:
http://www.sonymobile.com/global-en/support/contact-us/