The community repeatedly tries to crack these kinds of mystery devices and your first impulse was right I think … to try and switch things off and see what happens. Remember though that just because you switch something off doesn’t mean that the Found Device waveform is guaranteed to change if it is that device! It’s anti-intuitive … the device waveforms are still generated using the Sense algorithm. Look at the overall power change, not just the Device, in the Power Meter and see what happens.
That said, 46W intermittent with spikes does seem like a fridge … thought 745W spikes seem pretty high.
I’ve been trying to troubleshooting my fridge and I just realized that even though manufacturers don’t publish nice waveform graphs, although you can find more and more of them here on the Sense forum (!), you can probably find the Energy Star label for your fridges/freezers, unless they are really old.
My fridge, for example, is “475kWh/yr” according to the Energy Star label = 475/365 = ~1.3kWh/day = equivalent of a constant ~54W. I would expect it to use significantly less than that because it’s only being used by 2 people vs what I guess would be the standard nuclear family.
When I look at my fridge waveforms I see things hovering around 35-40W with 150W spikes. These readings are not interpolated by the Sense algorithm because the fridge is on a dedicated Wemo Insight that feeds data to the Sense. Meaning: this is my fridges’ energy signature. Sense is clocking the annual usage at about 220kWh. Worst case, you could get a Smart Plug (Wemo or Kasa) and try troubleshooting using that.
What the Wemo + Sense has revealed is that my fridge seems to be running within the manufacturers spec.