I haven't had this problem with mine for the most part, however I did have one particularly bad turnout that caused frequent derails. What I did was take a needle-file and file down the point so the transition from straight to divergent (when switch was thrown to divergent) was a little smoother. This fixed it for me.
Edit: Also possible that the cars/loco decoulper lever might be grabbing the point, I had that happen once too for a coupler that was a tad low, bending up the lever fixed that
Edit: Also possible that the cars/loco decoulper lever might be grabbing the point, I had that happen once too for a coupler that was a tad low, bending up the lever fixed that