It can be due to 2 much data (songs,videos etc).But you can download netqin mobile antivirus which i have done because my problem was same.you can download this antivirus from opera mobile store(in opera browser) or you can simply type 'download free netqin antivirus for mobile'.it supports all phone models.BEST OF LUCK AS I ALWAYS SAY.
Contact mobile dealer or service provider. before that, if you have too many songs, videos, etc, try to delete them. because your mobile may become slow due to storage of too many items
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