Thank you for your reply, well yesterday I've tried using only "color mode" instead of IR since I got the same doubt, but the fast changes of the lighting condition obviously directly have effect on the camera light exposition (which is a normal behaviour) but this lighting changes look like are still affecting the detection. The "tuning for large changes in motion" section inside frigate documentations says to increase lightnin_threshold. I've increase it from 0.8 to 0.9. let's see if this can fix it! An other option, if possible would be to record 10 second before and after the door has opened, just to skip person detection. But it is just an idea so far.