Nokia 5220 express music
The phone switched off

Sir,

I purchased Nokia 5220 4 months ago. Since then it sometimes used to hang and restart automatically. About a month ago the same thing happend and it never restarted rather a message was displayed "Contact Service". I went to the servicing center and they replaced my piece but a few days ago again the same thing happend. As a customer i request u to give a solution to my problem