The same problem here. MBP 15 i9 6c/32GB/1TB/Vega 20 + PD 17, running 4x monitor, using usually two monitors for Windows and two for Mac. All seems fine, but the disappearing dock and the need to click again in the Windows machine (happens when i click in Mac and go back to Windows, or if I click on different monitor in Windows) drives me crazy. It comes with a slight delay in response...