I recently discovered that one of my ST multipurpose sensor had erratic open/close events nothing was moving.
ST support changed asked me to replace the batteries, reset, move it out of the window it was mounted on but after a while, the jittering open/close were back.
I had my garage door magnet I didn’t use and by curiosity, I compared it with the faulty sensor one and surprise, it was differently polarized than the garage door one.
I then reported that to ST support who nicely shipped me 2 magnets. But surprise again: one of them is weaker than the second one and look more like the faulty one I have.
I made a video here: https://youtu.be/zp0RkLh0EFM (sorry for the noise and the camera reverse left/right… anyway): it is very visible the middle magnet is much more powerful than the faulty (top one) and the 2nd replacement one.
That would be interesting that those of us having sensors issues, try to swap magnets with sensors they have no issue with to see if this improves the situation.
Once we have enough people to confirm this kind of issue, ST could certainly address this as a manufacturing issue. The spec of the magnet to sensor distance is claimed to be 10mm, I can confirm this is impossible with the faulty ones.