My Iphone 3G reboot itself after few minutes when i done auto lock.

My Iphone 3G reboot itself after few minutes when i done auto lock. otherwise its working good and i m not facing other problems but when i do auto lock then after few minutes i press home button then my iphone start from the starting. Please help me is it firmware problem or its hardware problem ? i m using firmware 4.1 (8B117).
Waiting for your earlier response.
Thanks & very best regards,
Irfan.

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