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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
Potentially there could be an issue where if you removed the config file and then only restarted with BTN3 it didn't get updated, but after BTN1+BTN2 or the battery going flat it'd definitely reload the powerSave flag.
More likely something else was at fault, like maybe an app/widget using GPS?