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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
Is it possible that a phone/PC/etc is still 'paired' to the Puck so is auto-connecting to it?
You could also try powering up the Puck while holding the button - that'll clear out any saved code and Bluetooth Pairing info that there might have been.