I found the problem. I have grids that exist at different world projection (GIS stuff) and the coordinates were becomming very large. The clipping range was being set as I zoomed in using the Renderer ResetCameraClippingRange method. In some instances when zooming in the zbuffer was not able to handle the large coordinates and the image was tesselating/tearing/flipping out. I adjusted the calculations for the clipping range and all is well.