@cadet
I'm no expert but I would have looked at the data sheet and measured up to make sure that the hardware are not defective in any way.
http://ww1.microchip.com/downloads/en/DeviceDoc/39662c.pdf
Or the radio.
//Mattias
And be aware of this thread where the ENC module is hanging after a while..
http://forum.mysensors.org/topic/536/problems-with-enc28j60-losing-connection-freezing-using-uipethernet-or-ethershield-read-this