If you run that command multiple times, do you still get problems?
What voltage are you running the LEDs/board off? And are you sure you have connected GND between the board and the LED strip?
@Gordon started
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.
If you run that command multiple times, do you still get problems?
What voltage are you running the LEDs/board off? And are you sure you have connected GND between the board and the LED strip?