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Hi use a Visonic door/window sensor to do some magic with my lighting. This all works fine for all but one sensor. This sensor seems to change his address randomly. In order to restore functionality I have to 'Clear heard', then open/close the door and select the new code for the no-longer-working device.

The first thing that came up was that the sensor must be defective. However, my Visonic alarm panel 'sees' the sensor just fine. If the sensor is actually resetting itself and giving out new codes the alarmpanel should not be able to see it either. So I'm guessing it is something with RFXCOM, but I have no clue what it could be.

I have about 10 of these sensors in use and all work fine except for this one.

This is not normal behaviour. Are the switch settings in the sensor identical to the settings in the working sensors?

Yes, I dont use any of the dip switches on the sensors anywhere (Except for 1). Ofcourse it would be no problem to just replace this sensor, but I am interesting in knowing why RFXCOM doesnt see it but my panel does.