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That's probably an app acting up, boot on safe mode and check again, if you don't encounter this issue then it is a third party app, also do you have any widget or it just a pop up?
How to boot on safe mode
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
Most likely its a third party app, check this
settings > data usage > check which apps are using up your data.
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Anytime
How can i delete it?