My iPhone 4S keeps restarting itself?

Earlier on today, my phone died at 40%, when I switched it back on whilst charging it (took around 20 minutes) it was on 6% and then died, I charge it again and it was really low. I left it for a while and it went to 60% and mysteriously to 53%. Now it keeps restarting, I've tried doing the hard reset (holding the power and home button) but I've had no luck. Why is my phone doing this and how can I solve the problem?

Throw it away and get a new phone perhaps a Samsung Galaxy phone

Call to Apple customer care which is as good as it gets! As long as they continue having excellent care you will also be continue to buy Apple products as i.

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