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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
Are you using up to date (1v92) firmware?
Also, the only time I've come across this before has been when the battery is almost flat - the main processor works fine but the magnetometer stops working slightly before the ARM has trouble.
Please could you check
Puck.getBatteryPercentage()just to make sure?