sterretje:
According to the library file, it uses two Arduino pins for power. I find that strange; why not just 5V and GND?
that's because of the adaptor that can be used with the remote (link). They expect you to plug it straight into the arduino's analog pins.
sterretje:
Anyway, maybe you need to give it some more time to get stabilized. Additional delays between each nunchuck step in setup() and one before leaving the setup().
Noted, tried this - it doesn't change anything but will leave it in for good practice.