1. Tighten all the screws and nuts and bots and wheels and just sure everything is tight.
2. Find out what your bushing are, and if they are in the right weight for you. If your trucks arent tightened enough to get a loose feel, thats bad. For a loose feel, tighten up on some softer bushings.
3. Your pivot cup isnt snug in the baseplate. Take it out, wrap a layer of electrical tape around it until it pushes in snug is a quick fix. Get some new pivot cups tho if that is it.