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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
It could be that the USB wall adaptor was particularly 'noisy'... I guess cheap ones are probably designed to output a lot of power (1-2A) at 5v, and when Espruino a plugged in and draws 10mA, the signal is probably pretty noisy.
The other thing you could do is to call
E.getAnalogVRef()- this tells you what voltage Espruino thinks it is running off. It should be ~3.3v, but maybe the wall supply goes into some kind of power saving mode and the output voltage drops below what Espruino needs?