Was going to post something similar to Billi. iRex has said in the past that low battery conditions can cause funny things to happen with the sensors (it's also been known to cause temporary "line out" errors in the display). The first thing I would try is to make sure the battery is charged.
We've also seen issues with third party wall charges, that don't strictly follow the USB voltage spec, causing issues with the sensors. The DR1000 seems to be fairly picky about the power that it is getting.
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