I am second owner of a 2009 Sonata Ltd fully loaded every option.
Recently the dash lights began flickering on ocassions. Now the Navigation froze up rendering all the bottons non operational with an error code. The only way I could get it to work was shut the car off for a few minutes and it appears to have reset. Anyone have this issue? I have 29k miles. Otherswise I really like the car.

 

Unfortunately problems with the navigation units in 2009 Sonatas seem fairly common. Hopefully yours is still under warranty. I believe it is covered for 3 years/36,000 miles. If you are still covered under warranty I would take it into a dealer to have it taken care of.