Does anybody have the following issues? I am using an early 2013 rMBP 15" mostly maxed out. 1 - When you first log in to an account in Windows 8.1, there is a brief flash of black screen for less than a second. 2 - Within the first hour or so, there is another flash of black screen that lasts for at least one or two seconds. There is nothing in the event viewer to indicate a driver issue. And my NVIDIA drivers are up to date.