ok lets look back at what Smackre said. The screen says lost signal, but the computer stays running, while it is running, does the sound keep playing in the game; can you shoot a gun and still hear the gun fire? If the GPU was overheating, you would first see some artifacting, and then the system would lock up, the sound would begin to loop the last quarter second and it would continue to loop until it is reset. I have a lot of experience with overheating video cards, my geforce 3 ti200 overheated allot (crapy heat sink design), my 9800 pro overheated as well (passive heat sink and a hot case) and currently the top 6800 ultra in my SLI rig overheats unless I remember to turn on the extra fan I mounted.
Next time it happens, try unplugging the monitor, turning the monitor off, and then plugging it back in and turning the monitor back on. Or try swaping your 2 monitors for a week and see if it still happens.
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