Key won't go into ignition and start engine. on 2008 BMW 528xi

My car was detailed today at a car wash and when I went to pick it up, the key would not go into ignition slot. I got a warning light with a slash through the key. After several tries, the car started, but the key wouldn't stay in the ignition and the warning signal stayed illuminated showing a slash through a key. What could be the problem?

by in Lake Forest, IL on August 11, 2012
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1 answer 1 comment
ANSWER by , August 16, 2012
Not sure, but it may be either with the key or with the lock cylinder. Have you checked with the dealer yet?
COMMENT by , August 16, 2012
The next morning, the key worked and since then I've had no problems. Maybe some dampness got into the cylinder and it dried out. It's a mystery, but all is well. Thanks for responding.