Since I just got it I have 14 days to return and I believe exchange.
So far so good.
CKwik240 I am trying that app now. See if it goes down to 0 again over time. If so I will exchange it or sure.
It looks like the log is growing for me so depending on sample rate (which may be low to save battery) and how large a time period it displays (it will probably start a rolling time period at some point), it may not show a small blip on data. Especially if it does any averaging of values to smooth out the curve. If you decide to keep logging the data, I'd try and find an app that stores the raw data.