I am running Autocad 2019 on a Surface Pro 4. It runs great with the exception of using the pen. Just for testing and drawing a line the crosshairs jump around and go to a point I didn't select and will select the 2nd point at the point where the pen was with out me selecting the 2nd point. All snaps and grids are off so that's not the problem. It works great with the track pad but would like the option of using the pen. Has anyone else had a similar problem and found a solution?