We have seen the same, although we made it a bit more complicated for us. After disconnecting from tha cloud and shutting off WiFi we got the sleep power consumption to be as low as 600uA, but that came to the cost of a memory leek, see Memory leak in Argon doing WiFi.off() / WiFi.on() and Boron doing Cellular.off() / Cellular.on() .
This has been fixed after adding a delay for 15s after shutting off the WiFi, before going to sleep. We will look further into optimizing this.
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