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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.
@Gordon
Wow, yeah - so something's going wrong.
It turns out the rev 1v3 picos don't actually have a very good diode in them. It's fine normally, but if the Pico ever did get shorted out for a fraction of a second the diode could have gone slightly open circuit? One way to check that would be to put an oscillocope on the 5V pin and see if that fluctuates much.
If that's the problem it's easy enough to replace the diode though...
Not sure I understand about where the 100uF cap should go? Just put it right across the ESP8266 - I'd try that before adding a new regulator (as the Pico's one is good enough to handle the ESP8266)