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Hi..I having this problem when i got a message from someone it pop up on my screen with the text and the only thing i can do is cancel and save the text..if i press somewhere or back the text will not be in the messaging app..this is the normal messaging app. i even try factory reset but this problem still occur. i want it to normaly appear in the notification, i dont know what app or setting causing this. please help
Already done as you suggest..downloading 1gb data for the factory reset but the problem is still there. Seriously, im not playing or joking.
You should have your phone checked at a sony service:
http://www.sonymobile.com/global-en/support/contact-us/
Have you tried your phone with another SIM-card to make sure it's not something being sent to your number?
Not sure if an NFC-device could give a message like that but if you have your phone in a cover where you also have cards (credit cards, buss cards and so on), disable NFC under Settings -> More.