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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 -
rst cause:1sure looks like a power issue as you say.You should be able to supply power straight to the 3.3v pin on the board - but perhaps you could stick a scope on it (and the VUSB line) first and see if it really does fluctuate?
I guess you're powering the board itself straight over USB? Could you try a different USB cable?
Sounds dumb, but the regulator should be able to handle 400mA peak, with the biggest issue being heat dissipation. I've never personally noticed any problems like this (and I've used the flow control before).