First, this is a problem that shouldn't have happened, no doubt, but, I would not take a truck driver for CDOT opinion on this. A notice should have appeared on your screen telling you why it was shutting down. Were you driving in other than normal or snow conditions on the transmission? Did you put the transmission in 3rd or even 2nd gear for a length of time? If not, Hyundai mechanics will figure it out. I live in Colorado also, but don't play in the ski traffic up the hill, and haven't had mine for very long at that. I'm certain that this is a isolated problem and will be fixed and told why it happened by experts.