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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
Honestly, no idea - probably the big ones! If you have an oscilloscope then try looking at the 3.3v rail and see if the voltage fluctuates at all.
At the end of the day though, if you spent £5 on a board there's probably a limit to how much time and money you want to spent trying to fix it :)