I have a similar issue. Whatever it is comes on every 2-3 minutes for 27-30 seconds then quits.
It’s not any normal appliance, tv, computer or charging devices. I thought it could be a power factor correction device and not that either.
After turning everything off there were only two devices left , the sense monitor itself and my internet modem and router.
The Problem if I turn either of those off to test it… well there’s no access to the app or data, because sense depends on those running to diagnose.
So it’s either the sense monitoring device or my motem and router is the best I can figure if that helps.
Question is, does sense cycle like that and how much power does it use and can it detect itself? With that answer I could reduce it to the other.