My Nexus 5 arrived and while its a great phone for the price tag, I received a defective model with an extremely loose power button (my friend's barely makes noise, mine makes a lot of noise with a minor tap). While the phone still works technically, it's extremely irritating to hear the rattling when I type and make calls. I first noticed it a mere two days after getting the phone, and it's gotten increasingly loose over the past four weeks, so I finally decided to contact Google to get it replaced. However, when I talked with Google support on the phone today, the representative insisted that it was not a replaceable issue because it doesn't render the device inoperable (he did not accept the reasoning that the rattling impedes usage of the phone as, well, a phone) and because it stems from "slight variations in design and manufacturing". Is this the case or does the warranty cover obvious manufacturing defects like a loose power button? My cursory reading suggested it did, but I would like to make sure before I email Google.