You got hit by two bugs of 0.9.2 - the one is a small instability that can happen the card to crash even at stocks - rare but can happen, the other is that I made a mistake with the reboot call in Windows. Both will hopefully be fixed with 0.9.3 that will be out likely tomorrow Working hard on that one right now / testing it for stability. Also new version will allow to run with older drivers and will give better "miner displayed hash" <--> "pool hash" ratio Stay tuned