Like I said....

that's the exact problem that I had. Luckily it was still under warranty.

Mine was slipping and sliding like a JELL-O all over the road, like you said. It was really annoying, to say the least. Got kinda scary on the freeway too, doing anything above 60 made the whole truck wobble....

Now it holds the road fine. A little stiffer to turn, but at least it stays on the road!