My sensor kept setting off the alarm, too. The technician found a tiny spider near it - and that is what set it off. They reset it, and then a little moth flew in front of it - and there it went again. I wish they could set those things to only go off if something that weighed 100 lbs or more (and over 5’4”) moved in front of it. LOL!
Thank you for the sweet graphic, Amy!