First I would check and make sure everything is tight. Wheel lock nuts tightened up and nothing loose in the suspension system. After a while some wheel slop in any RC vehicle is unpreventable. Check the hubs and make sure they fit right inside the wheels as well. If anything is not fitting correctly then it's time to start replacing parts. With the wheels off the ground you are going to see the wheels wobble no matter what. Just grab the wheels and trying moving them in and out with your hand, if there's no play or just a minute amount, I wouldn't worry about it.