Anyone had any problems with the cruise control and gear shifts? I've noticed a few times on my V6, cruising at about 60 mph and go up a hill, the transmission sifts down from 6 to 5. When the car gets to the top of the hill, the transmission won't shift back up and the tach stays at 3,000 rpm until I shut the cruise control off. When I shut it off, it immediately shifts back into high gear and the rpms drop to the normal 2,000. Turn the cruise back on and everything is fine.