Please do, i have the same issue with mine. it happened when i W7 also. When i upgraded to W8 it came along w/ it. I found a quick fix for it. I have a Powered, Belkin USB hub and it works on BIOS and stops on OS load and then the USB hub restarts it. Itherwise i need to unplud the Keyboard.
Would be nice to hear if there is a real 'Fix' for this.
*Intel I7 3770k, ASUS Maximus V Formula Z77, EVGA Nvidia GTX 680, 32gb Corsair Dominator Platinum 1866, Corsair H100, Corasir Force GT 120 gb SSD (C: OS), Corsair Force GT 180 gb SSD (F: games), WD Caviar Black 1TB (E: Data), ASUS Blu-Ray drive, Corsair AX1200 PSU, COOLER MASTER Storm Stryker, Windows 8-64bit