My iPhone 4 has a short shut down@ black off(2 minutes shut down and resume) whenever I make a call or receive call. What should I do?

Hi,
Supposed I have a  iPhone 4 works normally, suddenly my phone rings, for 1 second then shuts down immediately. The screen blacks out with Apple icon appear, seems like shutting down. After 2 minutes, the phone resumes as normal. When I'm trying to check out who called me, there is no record.
Another scenario is I'm making a phone call to someone. The phone goes into the calling screen then shuts down. Similar as above, after 2 minutes iPhone 4 resumes without record who have I called.
What am I supposed to do? Please advise and help.
Thanks in advance.

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