This does not happen for every assy file I am working with, but it does happen about 95% of the time I am working. I have tried the Certified VC driver and that one made me very unstable, and this problem still occurred. Since then I am always checking Nvidia's site for their latest driver. That was also suggested by my VAR. They have been unable to help with this issue. I am hoping its something that can fixed by a setting or a registry option, etc... As I am in SW 2015 SP5.