I have been having the same issue, but this sensor is not the farthest in the home, and I have no problems with any of the other sensors.. I have also recently replaced the battery & the technician came out to reapply the sensor. The problem went away for a while, but has come back, and I can't arm the system without turning off the zone, but I'm worried that even if I turn off the zone, the alarm will go off in the middle of the night (this has happened before).
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