Fairly large residential installation. If sub devices of keypads, motion detectors etc are included approximately 300 devices.
Periodically, almost every device, lights, ceiling fans etc will turn on simultaneously to full fast on. This always happens when a motion detector is triggered. I removed the one I thought was offending, but then another picked up the behavior. None of the motion detectors are linked to devices. They all are used to trigger programs that trigger scenes. None of my programs or scenes encompass all devices and very few would result in a fast on, full brightness condition. Almost all ramp up to the 50 - 70% level. There is no X10 in the system and the transformer that serves the house is not shared with any other structures.
The log will always show the devices changed state always preceded by a motion "on". (1st gen 2420M) devices. After 7 years of this, I am confident the source of the all on trigger are motion detectors. The suspect detectors had fresh alkaline batteries.
I'm willing to upgrade the 20 motion detectors to the 2844-222.
Has anyone had similar experience and were the newer motion detectors involved?