I swapped back to NGK Iridiums.
I would advise anyone running nology plugs to do the same or just put in similar OEM spec plugs. The problem stems from the fact they have no resistance, so it can play hell with the electrics, accelerating failures.
List of known issues...
Throttle Bodies dying.
Coil Packs melting/blowing up.
Radio Interference.
Intake flapper motor fault code errors