@dramh this is usually battery related. you phone is a new phone so before you do anything to it, have it fixed under warranty. It is only a few month old and it will '''not''' get better with time
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=== Update (09/21/2017) ===
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@dramh the contacts for the battery temperature sensor are near the top of the charger. Try to attach the wireless charger to the phone. Once it is connected try to turn the phone on.
@dramh this is usually battery related. you phone is a new phone so before you do anything to it, have it fixed under warranty. It is only a few month old and it will '''not''' get better with time