ANY IDEA's?

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Yes, have a look here:

viewtopic.php?f=2&t=18405

The base is really important here as the graphic chip is resting over it (and thermal pads are present to avoid overheating)

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The GC is probably overheating, the best way is to remove the logic board, clean the area and use new thermal paste (a kit was formerly available to renew both thermal pads, but you can probably do without)