This appears to still be a problem. I added 6 of the ZEN 15 devices to the C-8 Pro as new on 2.3.8.125 and discovered this problem. @bcopeland or @mike.maxwell , any chance you can look at the code for the "Zooz Power Switch" Built-In Driver that is loaded when the Zooz Zen 15 is discovered? I resolved it for now by using the 3rd Party "Zooz ZEN Plugs Advanced" driver by JTP10181 located here: