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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
2v21 is just released - I'd be interested to see if you find it better.
Also, if you connect with the Web IDE, do you see any messages on the console when swapping between apps? it might help to see what's going wrong