I've a problem with my Sapphire HD5750. If I play any game after a while my screen going to black but the game is running in the background away and it has sound. I've tried the video stress test, but I passed it. I didn't overclock the card, it has the default values. In game it didn't warm above 50°C. Is there anybody who meet with this problem? I use AMD Catalyst™ Driver 13.9 and Windows 8.1 64 bit.