NOKIA 5130 Xpress Music Phone
My phone restart

I buy Nokia 5130 Xpress Music in last week MARCH. Now I face a problem with my Nokia set, some time when I play Music in my phone set the phone automatically restart. Please tell me what the problem with my Nokia 5130 handset is. Is it big problem? Why my handset restarted atomically?

I send my problem to nokia customer care but nokia sen me no Suggestion

Please give me Suggestion