I noticed this today, so took the back off to find out what was loose in case something shorts out inside when it's on.
One of the small screws holding the sensor board onto the case had fallen out so I screwed it back in. The other one was slightly loose, so maybe they weren't fully tightened during assembly. I'm only mentioning it in case it helps with your QA.
I have to say now I've seen inside, the manufacturing quality and attention to detail is outstanding. As good as anything I've seen in electronics and I've seen a fair amount.
Thanks for a great product. Now, where's that firmware update!?