Fix required for Nanode RF Boards
Testing has found a problem with the Nanode RF board. Initialising the ENC28J60 ethernet chip can cause the ATMega328 brown out and reset.
Adding an extra 10uF electrolytic capacitor between GND and Vcc fixes this.
If you have a Nanode RF PCB you should add an extra 10uF electrolytic capacitor in the space left for the ISP header. Long leg goes to pin 2, short leg to pin 6.