Where one issue could be construed as a simple manufacturing deficiency, the other issue over an expanding battery is possibly cause for a bit more concern.
To their credit, Motorola acknowledges that it has seen “a few” bad devices in the mix and is prompting customers to contact the company’s customer care team. You can also try bringing the device back to the point of purchase as having something like this happen (without dropping it) is a manufacturing defect.
By accounts we have seen so far, it looks as though Motorola and the carriers have been on the up-and-up for replacing affected units, so if you find yourself with a defective Nexus 6, you should not encounter too much of a problem getting it replaced.
Have you had any issues with your Nexus 6?
sources: Phandroid via Android Authority