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hi guys
the walkman close suddenly on starting some music although i played them before and played them on other music players
also the file manager close on opening it
Most likely its an app acting up, reboot on safe mode and check if it happen, if it doesn't then it is an app
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
