On the order of every two minutes or so, my HS103 smart plugs, when off, are very briefly turning on their receptacle and immediately turning it off. It amounts to a split second zap of power. Is this some kind of connected device status detection or something, and can I stop it? Lamps probably don't care, but I don't think my Pi's are liking it much, and it's a distraction to keep seeing their LEDs and cooling fans flash. I thought it might be my Echos doing it, but take them out of the picture and the behaviour persists.

Thanks all.