Yesterday, I upgraded to 8.1. Since it finally became available on MSDN, I figured it should be stable enough for daily use. Boy, was I wrong. The Steelseries software completely bricks the OS completely, not even able to get in Safe mode and most games ran much worse. Some of them even exhibited random glitches and artifacts. I can live with all of those, what I can not live with though, is this: The internet drops out of nowhere, at random times and it comes back after a couple of minutes so I don't have much time to diagnose it. The weird thing is that changing the port on my router fixes this issue immediately. I'm pretty sure it's not the router's fault since I did not have any issues until I installed 8.1 and my phone who is on the same wireless network is also fine. PS: Clean install, old P35 MSI mobo with integrated LAN.