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@Spxtz I have had the problem with my first Nexus 5. Later it turned to a brick and was exchanged by Google for a second one, then a third, all of them because of this problem. It is a hardware failure of the power button. You can try to smack it on the side quite hard...
In the end after 4 Nexus 5 between August and now, Google has decided to refund me completely - so I have 400€ back to spend on a new phone. I'm almost decided for Moto X Style, but I like the 5X too. Opinions?
@Spxtz I have a Nexus 5 that does that. I'd be interested in what you find out. Internet seems to think it is either the result of firmware upgrade, or a hardware problem with the power button.