We have had X-10 for decades and never had this issue before!
We use the IBM Home Director HD11A (same as CM11A) and ActiveHome1.42d software. We have many X-10 switches and all work. Sometimes when one stops it is because of a lamp being burned out from our multi- light outside lights.
Anyway, we just added a new power center for my wife's new system. Since then, several lights come on at random times during the day! I now took it out of the circuit and have added her old power center back to see if that is creating the issue. However, what I want to know is how this could be the cause? I ask as I have had noisy components before, but they just prevent a light from going off if it was on, or on if it were off. I never had a component turn a light on at random. It seems to me that turning a light on, in this case C2, should not respond to random noise, but takes a bit stream...ie11000010 (C2) with a code for ON.
Can the noise corrupt the software in the CM11A? I am testing with the old power center as I said, but wonder how this could happen.
OH, for extra credit, is there a better Computer interface available now with more memory and better software that is not as prone to line noise? I heard about the CM15, but also heard it was very prone to noise...especially the clock.