Had that problem in a previous car, had the wife stop by the dealer every time she passed by. We had 2 tows to the dealership under warranty verified by the tow truck driver, no start, glad we bought the $1400 7 year extended warranty and it was 4 years old at the time, it covered tows and repairs, then after the tow to the dealer the car started right up. No possible explanation at this point they say. Asked the dealer to be on high alert if she stopped by and the engine would not start. Not to long later she stopped by the dealer and it would not start. They were so cooperative and on high alert. Checked it out right away, determined it was a bad fuel pump and replaced it and fixed the problem no charge. Diagnosing in failure mode is the best method in my book, otherwise you are chasing ghosts. No event logging or cel etc. Sure Many say I lost money on the extended warranty deal, but times were tight, and 2 tows, 2 analysis charge and nothing getting done would have really cost me money, and then the free repair. It is insurance, Maybe I did not break even but it was nice to know I did not have to start turning in change to pay for useless services.