Jades rarely if ever need repotting. As mentioned previously, they do not like their roots disturbed. If you are new to plants, the chances are very good that you did not repot properly because repotting is not so simple as finding a bigger pot and filling it up with fresh soil. Unnecessary repotting is the single most common cause of plant problems, so keep that in mind for the future.
Jades do tend to become top heavy with their heavy, water-filled leaves. However the solution is not a bigger pot, but judicious pruning. Unlike repotting, pruning is not at all traumatic for plants.
I suggest that you start by removing the stones you put on the surface. The stones prevent the soil in the root zone from drying out soon enough. They also prevent you from probing the soil and determining when it is dry enough to water. Allow the soil to dry about halfway down from the top before adding any water. Do NOT water by the calendar or any other predetermined schedule. If you have it outside, keep it shaded at all times.
