My Active Home Control/CM15A was emitting a faulty RF signal that first presented with problems in working various lamp modules via my key chain remotes. I first suspected a defective lamp module but I deferred fixing this and now wish I hadn't, it would have put me on the correct path a lot sooner.
Slightly later the the Home Security System Console (DS7000) could not sense all the window/door sensors. At this point I ordered a new DS7000 as the one that seemed to be faulting was pretty old and I thought his time had come. However, when the new DS7000 arrived it worked worse then the older one. At this point thinking I had a dead on arrival new DS7000 I exchanged it. When the replacement arrived and it too failed, THE OLD MAN's LIGHT BULB went on, some part of my X10 system was emitting faulty RF signals.
First guess nailed it. It was the CM15A showering my house with god knows what, perhaps RF from DC to the full spectrum but it was gagging the RF airways for sure. When I removed the batteries and unplugged the CM15A everything else immediately functioned correctly.
So now I have a extra Home Security Console, that might come in handy someday but I wanted to share my experience or lack there off so that others first might not defer trouble shooting and perhaps when RF issues arrive consider looking at what might be a faulty source other then that which is failing before going the replacement route. Good Luck with why you might have come to this post and hope this tid-bit helps someone.