3 weeks ago I had those same white flashes, updated my nVidia GeForce GTX 1070 Drivers to the latest and the flashes went away. Have no idea if those Drivers did it, or some other weird hardware, firmware or OS update that happened automatically around the same time. I've accepted that all these early stage, wonderful technologies like VR depend on your specific combo of Hardware/Firmware/Software.................that it either works or it doesn't. I can't imagine going back to my triple flat screens so I am glad AC, iRacing and pCars are working for me good enough, so everytime one blows up................I can hop over to another title......