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[Billy150]

I've had my PS 561 security system in place for over 3 years,  and the Active Home Pro system.  It's had a few hiccups along the way,  but overall it's been dependable.

I change all batteries about every 18 mo.  All are good right now.
My problem lately is,  sometimes it won't arm.  I have 7 window/door sensors and 3 motion detectors (MS10A).
So,  window/door sensors are 1-7 and the 3 motion detectors are 8, 9 10. Throughout the day #8 light on console lights and of course it won't arm.  If I check it an hour later it's ok. 

Usually by bedtime it's acting up again.  I replaced #8 motion dectector with a spare new one.  I initialized the entire system again and still have the same intermittent problem.

Any suggestions would be appreciated.

Bill...