The same story (RLC-420) - clouds and insects flying around camera triggers notifications every few minutes. Sensitivity option doesn't work - if (as they recommend to decrease) sensitivity level is, for example, 5-10 then camera misses me on the bike but still react to clouds and flying insects around the camera.
So the camera is useless for me.
Cameras with PIR in general work in my case but in this case there are no Motion detection zones so my two Argus 2 cameras catch even buses and cars driving 50 m away 
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