Why does my iPhone keep restarting?

I have an iPhone 6 and it has the newest updates and stuff. Recently it's been restarting 1 to 3 times a day. I'll be using my phone when it just goes to the black screen with the apple symbol on it. I have no idea why it's doing this. Anyone know?

Is anyone sending you the effective power message? Because that can crash your phone. Current update hasn't patched that yet.

I'd restore the phone if need be, of course doing a backup before hand

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