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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
Glad you got it sorted! It might also be worth checking the battery voltage?
While Puck.js should last for around a year on the battery, if you're playing around and upload code that keeps it very busy (and then you leave it) then it's quite easy to burn through your battery in a day or so... When the battery gets low you can get all kinds of issues like this.
Removing the battery for a while may have just let it recover enough to start working momentarily as well.