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If you're running the latest drivers, and the fan is still running, it's not shutting down, but perhaps it's getting hotter on the inside than the components can handle? But continuing to power the fan is a sign that it's still trying to keep cool. If you're comfortable taking apart your notebook, you may want to reseat the cooling mechanism(s) on your cpu and/or video chips. It's possible that a component is loose and you may need to clean off the thermal paste (isopropyl alcohol and a cotton swap works well before re-applying. Make certain that you do not use too much, because spilling it could be hazardous to your motherboard.