Recently I broke Mike's number 1 rule. First time a car leaves me stranded it goes on sale the same day. Our DE went into turtle mode while in the garage. Long reset (second cup of coffee and a bagel) fixed the problem. Have not happened since. I don't believe having a second cup of coffee and a bagel qualifies as Stranded so the DE stays (love the DE). Having said that, given my age and South FL location, if it happens on a hot Summer day the DE is a goner.