I have two 5K Ultra-fine displays, connected to 2016MBPro, 2.9 16GB,Radeon460 2TBSSD. Top of the line everything. I solved the monitor random disconnects by moving the wifi router 4 feet from the monitors - thanks for that suggestion. Now dual 5K monitors work fine - except when going into Parallels, booting windows, and running Excel. I can do this fine with only one 5k monitor connected (doesn't matter which one), but no matter how I try to connect and configure two 5k monitors, once I bring up Parallels, booting windows, and running Excel the parallels monitor display goes black and occasionally , briefly displays the excel content. When I do move cursor to that screen, the cursor becomes the blue windows 10 spinning circle. Again: - EVERYTHING works fine with either 5K monitor (only one connected) including Parallels/Windows/Excel. - EVERYTHING works fine with both 5K monitors connected for all things under Mac OS. - The problem comes when trying to run both 5K monitors connected and then going into Parallels/Windows10/Excel Any ideas on proper configuration settings for Parallels, to use the best approach to memory, graphics card settings, etc?