Fibaro PIR trouble

[Xirilius]

Hello,

I have a brand new Fibaro Pir sensor (FGMS-001)
It detects motion without somebody in the room, even when i put the PIR in a closed box it keeps sending (every 20 – 300 seconds)

I did a reset (confirmed by fading red led)
I deleted, excluded and included the sensor twice on my Fibaro HC2
Can i try something else, maybe new firmware before i return the sensor?

[Phaeton]

Are you sure it detects motion? The device also detects shaking. Thats quit sensitive. I had to send my devices back to poland for an update... So maybe first disable movement sensing and see if that works? I have no hc2 so might be wrong with my sugestion. If so, sorry