I think you said elsewhere that they are new and that they are photoelectric rather than the radioactive ones.
I’m purely taking a shot in the dark but I’m wondering if you should try sealing up the hole(s) in the wall that you made to run electric and to mount the detector
My thinking is that dust might be getting caught up in a tiny draft through that hole and it’s so close to the source that it sets it off. Cause like, if wind hits the side of the house, there can be some positive pressure in the crawlspace which often also means inside the walls.
I guess maybe somehow there could be some stream or condensation as well. If it’s right by the front door and the humidity is high, maybe the hot air from outside meets the AC air and causes a tiny amount of condensation. Or if you live in hellscape temperatures, maybe there could be some vapor generated because of the hot air.
Suprising how numb we all are to countries saying they will make an entire population suffer rather than talking about fighting the military. We are just one or two layers away from countries saying “we’ll kill all the babies till they regret even thinking about looking at us sideways”