I expected the 2nd one to be bad.
What I'm guessing is that mine froze in transit at some point. UPS delivers mine so that would be the first place they would look. I work for a "major shipping company" and I know that most terminals are somewhat heated so they really shouldn't freeze. I'm sure NxStage will start looking at each stop these were at to find out where this happened.
That is, unless, this is a manufacturers defect