Hi RMS, you need to look for a kernel panic log (/Library/Logs/panic.log) or in the system log or console log for warnings that the video card was reset.
We've had a couple instances of this, but it was a case of the video card giving out and MA showing it since MA works the video card for a long period of time. Other possible causes are corrupt or buggy video card drivers (boot from a fresh install of the OS).
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