My head unit locked up a couple times, and both times it was some Korean error message. Turning off the car several times before it finally went back to normal. Had the car only a few months, it wasn't even a year old (i'm second owner). And they said the same thing at the dealership, needed a new head unit. was under warranty so no sweat for me, but for you, could be an issue.
Another thing though, the updated map did change the way the confirmation message would display. The one that tells you to drive save, don't be distracted, actually I don't have any Idea what it says, I've never read it. But it asks you to confirm before continuing at every startup, and you have to do that for the message to go away. Anyway, the map update for mine actually gave that a brief timeout, so it goes away after like 10 seconds without having to do anything. So that said, if you have an old map, and you still have to push the screen to get it past that point, you could try updating the map memory card see if that solves your problems.