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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
Thanks! Glad you got it sorted!
The only thing I'm aware of that will keep Espruino in boot mode is if B12 (the button's pin) is a logic 1 on startup. It should be pulled to 0 with a resistor and then BTN1 will short it to 3.3v when pressed.
I guess it's possible that your board has a manufacturing fault and that pull-down resistor isn't connected properly or is damaged? Otherwise it could be that occasionally BTN1 gets stuck down...