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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.
fishhf
Just to add that for most of the people that reported problems, literally just updating firmware, leaving the watch on charge for 12 hours and then doing a factory reset (hold the button down for ~10 seconds until a 'recovery' menu pops up, then choose 'Factory Reset') seems to fix issues for them, so I believe it is some kind of software issue.
I'm struggling to see what's causing the problems, so any insight you have would be great - but hopefully when I get hardware with the issue in-hand I'll be able to reproduce it and fix it.