Question about the surge signal (noise?) by metaMotionR devices/Android App

edited March 2020 in Hardware

I bought 2 MetaMotion R devices , and I have updated the firmware by android App. With them I collected motion data by using the default (raspberry pi) API and my smartphone App (MetaBase).
The sensor seems to have an obvious noise even I left it on the table without touching it (see the following figure).
Does anyone have the same issue? What is the source of the noise? Except applying filter afterward how should I avoid the surge signal?

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