Whoa, this is freaky, so many people suddenly experiencing the firestorm problem all of the sudden. Mine started a couple of weeks ago, out of the blue, my X10 system quit turning on and off lights. I reset my CM15A, still had the problems, bought a whole house power line filter (install over neutral wire in breaker box and connect to neutral, and both sides of the split-phase. Still no help. So it wasn't external signals coming in. Then I installed a XPCR, and unplugged my SignaLinc 4816B2 that is when all hell broke loose. The system started working again on most circuits. Then I noticed in my activity log in AHP the firestorm. Started reading on the internet that the CM15A and XPCR do not cohabitate. The CM15A is a 2-way device that initiates a firestorm and the XPCR keeps repeating. So I disconnected the XPCR and no longer have my 4816B2 plugged in, and I not have a good portion of my system back. I have no clue on what suddenly caused the 4816B2 to start jamming signals and am upset I wasted money on buying the XPCR that will not work properly with the CM15A. I have an X10 signal strength meter on it's way, would love to get my system back to normal. I've been an X10 home for over 20 years now and feel lost without full control.