Recently I've been having an issue with my key only turning to the Acc position and thus the key won't come out. Leave the car for a few hours and it will turn with no problem. Problem is sporadic in nature but never when it is left for several hours. Tried different key and that doesn't seem to help. Any suggestions before taking it to the dealer? Example: No problem yesterday morning, drove to blood drive - after 2 hours - no problem, drove to Sears - after 1 hour - no problem, drove to Walmart (about 3 miles away) stuck in ACC position, unable to lock door with other key so had to leave without shopping, drove home - another 3 miles - no problem - 