Macbook Pro 15" i7 2.66Ghz restarts when left idle

I think there is a problem when I have the Energy Saver option for Automatic Graphics Switching enabled and my machine is left idle, upon leaving for a meeting several times yesterday I came back to have my machine restarted at the login screen. This is a 3 day old fully updated machine running Snow Leopard 10.6.3. Anyone else experiencing this issue. After switching this off it has not restarted for over 18 hours now.

I've figured out the problem, Under Security there is an idle logout setting that somehow got switched on when I upgraded to Snow Leopard. My old machine did not have this setting on and thus it was timing out due to inactivity and looked like a restart but was actually a logout. If Phone support had gone through this setting the logic board would not have needed to be replaced. At least It's resolved.

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