I'm running the electric for a home theatre; I've installed lighted movie posters that plug-in to standard electrical outlets. The lights within the boxes are LED light strips with transformer/reducer boxes on the plugs.
I have one 2-gang outlet box on one wall; another 2-gang on the opposite wall (each with three lighted posters which means three of the four outlets per group are in-use). The circuit goes back to a Gosund Wi-Fi 3-Way switch (setup as single-pole). I've installed (literally) hundreds of the Gosund Wi-Fi switches, but never one that's controlling outlets (only lights).
When the switch is off, I'm reading 73 volts on the outlets when there is nothing plugged in. When you plug in one poster, the reading drops to 33 volts, then drops to 18 volts when you plug in the 2nd (and that's with the switch OFF)
I assumed with 73 volts on an "off" plug, there must be some ground contamination; so I took the wi-fi plug off and replaced with standard; and it's fine. No leakages.
I've read that wi-fi switches do send current even when off; but 73 volts? That seems like a lot. And, no clue why it drops as you plug in more "stuff"; unless the transformers are soaking up some stray voltages.
I've also swapped out the wi-fi switch itself - same result.
Hoping someone with more experience with wi-fi switches could help me troubleshoot :)