Did you get an answer to this? I also have an Argus 2, PIR sensitivity set to high. As an example, my front door camera did not start recording today until my mailman was standing directly underneath it. It did not sense the motion from his truck on the road, him on the public sidewalk, or him coming up my walkway which are all in view of the camera. Not until he was at the mailbox directly under the camera did it record.