Go to settings, Zigbee and open zigbee logs when you hear this clicking to make sure itβs not spamming your mesh. The clicking could be the outlet going bad.
I just went to the Zigbee log, maybe for the first time, lol. Without actuating, the Centralites seem to report in every five minutes as well as the Hue motions. The two SmartThing arrival sensors though, every 20 seconds, lol.
I might try putting a Centralite plug close to where I usually hang out in the evening to see if I can hear anything. It's very sporadic though, and I can't imagine a click without the relay operating and lights going on and off, along with an event entry.