 I bought a new 2012 VW Tiguan SE 4 Motion Automatic and in Drive (D) traveling about 25-34 mph the transmission stays in a high gear (5th) and makes a vibrating hum and shake.The transmission will not drop back to 2nd, 3rd or 4th at this speed and is overloaded in 5th.When I give it some gas it hums, lags and shakes more. After applying extra gas it abruptly downshifts lunging the car forward in a jerky fashion.I notified the dealer twice about this issue. The service rep told me the car is in its Adaptive Learning phase and will work this problem out after I drive it for awhile. After 3000 miles the Tiguan transmission has not adjusted as the dealer indicated. 