BBC micro:bit Espruino v2.05 quite unstable?

Ok,

I now have some code which crashes the BBC micro:bit within seconds:

var Gfx = Graphics.createArrayBuffer(5,5,1);
Gfx.flip = function () { show(this.buffer); };

function currentXYZ () {
  return [2,0,5];
}

function updateDisplay () {
  var XYZ = currentXYZ();

  Gfx.clear();
  Gfx.drawLine(0,4, 0,4-Math.max(0,Math.min(4,XYZ[0])));
  Gfx.drawLine(2,4, 2,4-Math.max(0,Math.min(4,XYZ[1])));
  Gfx.drawLine(4,4, 4,4-Math.max(0,Math.min(4,XYZ[2])));
  Gfx.flip();
}
setInterval(updateDisplay,100);

Does anybody have any idea why?

[EDIT] if the WebBT connection is kept, but the display runs havoc, the IDE's terminal sometimes issues New interpreter error: MEMORY_BUSY. Does this message help you?

Thanks in advance for your effort!

Kind regards,

Andreas Rozek