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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
Hmm. I'm not sure I'm afraid. Where did the bluetooth module come from? Perhaps the module itself has some kind of intermittent connection...
Or could it be an intermittent connection on the Espruino board? maybe try pressing down on the chip's legs near where it says 'ARM'.
From Espruino's side it's really simple - no components, just Gnd, 3.3v , RX and TX wires - so if they are all connected properly I guess that only leaves the module.