Correct me if I have this wrong, I'm not the car expert, and am not trying to pass myself off as an engineer or anything. It looks to me (and others) as if the lifters begin to slam down against the cam lobe when cold due to excess play, air in it etc. This comes in the hints of ticking and some misfire when cold, but they often won't bring the car in until it's virtually undriveable. It clears up quickly but will do this every time it's cold. After a period of the lifter banging against the cam lobe, the roller at the bottom can't take any more and quits turning, or binds. Then the cam lobe gets torn down and the car comes in with 3 or more codes.