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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
That sounds ok... D27 shouldn't be the capsense pin either (it's D11), but it shouldn't cause you any problems.
Could you post up the full circuit you're using? My worry would be that if you're switching GND on the external device, when the device itself is off then the voltage on that device (and all pins coming from it) will be at the battery's voltage - which is probably far higher than Puck.js is supposed to take.
You could try measuring the voltage between GND and every wire going to Puck.js - realistically they should never be any higher than 3.6v. If they are if could be causing damage to Puck.js, and would certainly explain watches going off all the time.