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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.
@HughB
Have you got heart rate monitor set in the recorder. It takes a lot of power.
As the HRM only works properly when stationery I don't bother with it and set it to off.
Sounds like you have more than 1 issue. You should not be getting a blank screen. Try simplest clock for a day or so, as it's minimal and does not get changed often.