My Jeep has needed a new ignition switch since about a year after I got the truck. It was still under warranty initially but I couldn't get the dealer to do anything about it because it wouldn't fail in their custody. I'm just waiting for my notice to come in the mail!

It only happens a couple times a year - I'll be cruising along when suddenly it feels like I hit a wall. Nope, that's just the engine shutting down. Usually it starts right back up by itself; but a few times I have had to throw it into neutral (at speed!) and cycle the key. After the first couple times, I have made sure to keep my knees clear, so I know that's not the problem.