hi guys also having the same problem after the recent windows 10 update. I am somewhat relieved that this seems to be a nvidia/ windows update issue rather than hardware as I have been troubleshooting all night over this. Like you guys this only happens after a cold boot and cannot be recreated after a hard reset. Literally the exact same pattern as the pictures above.
Build:
Intel I7 6700K, Msi GTX 1080 Gaming X, 16GB Corsiar Vengeance, 250GB SSD, 1TB SSD, 2TB HDD, 1440P Asus Rog Swift 144Hz Gsync monitor 27', 1080p Accer XB240B 144Hz G sync monitor 24'