Is it possible that you're hitting this issue? http://www.espruino.com/Troubleshooting#i-typed-save-but-espruino-won-t-work-or-stops-working-quickly-when-powered-from-a-computer-it-only-works-from-a-usb-power-supply-battery-or-the-computer-when-the-web-ide-is-running-
To do with print statements when plugged into USB but no terminal app is running?
Also, how are you powering the Espruino WiFi if you can plug/unplug USB? It's possible that if you're using much above 5v to power it, you can get the voltage regulator so hot that it shuts down?
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