Bought a new QX56 2008 in 2007 and have noticed a problem with the steering wheel. I notified the dealership at the 12000 mile check up but they felt there is nothing could be found. The problem is that when traveling at high speed levels, say 60 to 80 mph, and have to apply the breaks, there is a definite " chemmy " or shake in the steering wheel. There is no pulling when the breaks are applied or when driving. Any ideas ?