I just got mine too work again... I don't know if it will work for you but I thought I would let you know. I switched my PhysX to CPU in the nvidia control panel, ran CCleaner, and restarted my PC. I don't know why that fixed it because I switched Physx back to auto-detect to see if I got the same message and it still plays. Whatever happened, thats what I did. Hopefully it works for you.
Could be your power supply - the more laod you put on the gfx card and the hotter it gets, the more power it drains, so if you power supply could fail to deliver the required power and that causes the gfx card to fail, so the gfx driver stops working and you get the error "device hung".
Try open your computer case and see if that helps, typically power supplys go down in efficency if they get hotter as well.
