Thank goodness I Googled this issue and found these forums. Picked up a 2012 for the Wife last weekend and we just came back from a 200 mile road trip. At times the car would just oscillate back and forth in lane as you could never keep it straight, there was a dead zone and then it would simply kick in and over correct. I thought I was loosing my mind........
I'll take it back to the dealer shortly. It's so bad at times I worry for my Wife's safety. Other than this bizarre issue it's a gem.