Hey, sounds like you have a bad tumbler. It is best to go to the dealer for that. They can match the tumbler to your VIN and your current keys will work with that tumbler. I had the same problem. Take it in as soon as possible, who knows how long that thing will keep working. Just hope it doesn't lock up completely because then they will have to drill the thing out and it will be even MORE money. I'd recommend buying the tumbler from them and doing it yourself. Tumblers are very easy to replace if the old one turns.