Why did my new Moto Z3 shut down?

Got this phone 3 days ago. Came loaded with Oreo 8.1.0. Updated with new security patch immediately. All seemed well. Then yesterday the phone just shut down. Power on button did nothing. Plugged in to charge - nothing. After about 45 minutes the phone came on and all has been ok since. When this happended the only thing different was that it was the first time I had let the charge go below 10%.

My questions are: 1. Has anyone else had this happen, and 2. Should I return this phone immediately and get another?

Thanks.

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