The official drivers havnt been released yet to support the game because the game hasnt officially been released yet.
so there are no drivers to tell your computer how to run ther game so what happens is that it overheats and your laptop automatically disables your gpu to cool it down so it doesnt get damaged. I have the same problem with mine and lots of others aswell, even people with huge rigs.
When the drivers get released it should alleviate the issue.