IPhone restarts while charging?

I have an iPhone 6. Whenever it's charging, it restarts. It starts to vibrate and then restarts. It happens only while it's charging and restarts at anytime during it. It doesn't happen always but it is getting more frequent now. I've tried changing chargers but same. It annoys me very much and how should I put an end to this? I'm running IOS 10.3.1 in case.

Sounds like a battery issue. I had a battery issue with my original iPhone 6. The percentage would either freeze at 100 percent, then randomly shut down until i plug it in.Or, it'll fall to around 50 percent, and shut down until i plug it in. I backed up my phone, took it in to an Apple store, and they just gave me a replacement. I would make an appointment with an Apple store near you and see if it costs anything for repairs.

Let an Apple Store (or Apple Support on Twitter) know & go from there.

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