it's a long shot that it would happen on it's own but, after my dealer put a new top end in ,my 06 i had the same symptoms, after many trips back to the dealer and lots of argument, turns out they torcked the head 5 lbs light and it was setting my knock sensor off. retorked the head and never had another problem. I would recomend the dielectric greese also to held avoid corosion of the pins. good luck