My 2008 sorento suffered from this malady and I was advised to grease the yoke. I did and it really made no difference. I then brought the vehicle in to KIA and was informed that I needed a new drive shaft. Well, they put it in this past Friday and it seems to have done the trick. I am not sure if the grease route was too late, but the shaft replacement was what was needed. Thought I would pass that on and say thanks that the KIA comes with a great warranty!!! Jay