A Hall effect device is just a solid state switch. It is essentially a transistor which conducts (On) in the presence of a strong magnetic field. So, like any silicon device, it generally fails completely, if it fails at all. But, intermittent operation might occur is the magnetic field is marginally not strong enough to completely saturate the switch. The field strength is controlled by the distance between the magnet and the switch. So, if possible, move the device and the magnet closer together. Tod
Resistance is Futile.