My 2011 2.0T w/ 18k miles had been solid for the 1st year in a half until yesterday when while accelerating I was greeted with ticking from the engine followed by extreme drive train shudder and a loud bang. I had her towed to my dealership for diagnosis. I called them this afternoon and they told me the the spark plug in cylinder 3 had lost it's tip and caused the issues. My question is how could this happen, has it happened to anyone else and what other damage could it have caused? I don't think that them replacing my plugs is going to be the end all be all.