My grandmother's CTS has this weird problem. Sometimes after it is parked, the key won't come out of the ignition. I found out that if I tap the shifter forward, it clicks and then the key is released. I'm assuming that even though it has been moved up to the park position, it sometimes just doesn't click into the appropriate notch without an extra little nudge. Is this a common problem with the CTS? It isn't a huge deal - after I tell my grandma about five times that she just needs to nudge the shifter when the key won't come out, she will probably remember - but I would expect better from a $30k car. Is there a TSB about this problem, or a simple fix?