My iPhone 4S suddenly turns off?

During charging, my iPhone would just suddenly turn itself off then on again. It does it constantly. Usually when its on charge. When it its off charge, the battery percentage stays the same… The only way to change the battery percentage is to restart the phone. I just had a 2 new battery installed and both are still the same issue.

What's is wrong and do i need to change any componemts?

Try pressing the home button on the front and the sleep/wake button on top at the same time for at least 10 seconds. That will reset your phone. You should also turn off your phone about once a week by holding the sleep/wake button and sliding to power off, then turn on again to keep it running smoothly.

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