The iPhone 4 turns off when I receive or make voice calls

My iPhone 4 turns off when I receive or make voice calls...
The problem occurs several times a day, but not all the time i make or receive calls
I already tried several times to restore the iPhone as "new device " but the problem persists.
Someone has already met and eventually solved this problem?
I cordially greet and thank in advance

I'll try to do that! Thanks again

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