737NG new problem VNAV e service 1.1

I have also installed the last available patch but when I insert the VNAV the airplane salt but it begins to dance in continuation and if I look from the visual ext I see that the aileron of the plan of tail passes fast and in continuation from it beats / it zooms and it also happens in FL of cruise.. he doesn't succeed to tender the assigned quota and the VNAV it is disconnected, for more if I use the speed of the simulator to 4x or 8x the airplane it falls inexplicably.... it is a known bugs??? or have I mistaken something in the installation??? thanks for the help and you excuse my English Ciao Nassi Filippo