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Check if you experience the same while on safe mode
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
How big are the files? does he has an antivirus, taskillers, etc?
Check if you experience the same while on safe mode
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
That's a huge file and it will go to the internal storage, by default.