Leo says it's possible that the graphics card could be slowly working itself out of the slot causing him to have to reseat it, but then it would just stop working altogether. Leo thinks it's more likely overheating, but Christian doesn't believe that's the case and thinks it's the motherboard instead. Since Asus made the motherboard, Leo advises running the Asus PC Diagnostics. He also should try updating the firmware. It also could be a problem with the motherboard, a small short in the circuitry that is breaking his video cards. The chatroom suggests GPU-Z, a program from TechPowerUP.com.