I'm not sure why, but Civ IV is unexpectedly quitting on me a lot. It typically happens between 10 & 40 minutes into game play, and it doesn't seem to be triggered by any action in particular. There is no error messege of prolonged crash, I'm just playing then all of a sudden I'm back at my desktop and Civ IV isn't running anymore. I recently upgraded the drivers for my graphics card for my ATI x1600 Pro and suspect this might be related tothe cause. Any ideas how to make this stop?