Is the Pico still working when it's drawing 700uA? When it starts it'll end up drawing maybe 30mA for a fraction of a second, so if what you're using to measure power draw can't supply that, it might be the voltage to the Pico drops and it actually fails to start properly?
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Ok, I'll take a look.
Is the Pico still working when it's drawing 700uA? When it starts it'll end up drawing maybe 30mA for a fraction of a second, so if what you're using to measure power draw can't supply that, it might be the voltage to the Pico drops and it actually fails to start properly?