First of all, your graphics driver is a year old, so update that and it might help. Stay away from beta drivers though.
Second, it can help if you disable the Intel graphics chip and then run the game. It might be a good test in any case. That should make it impossible for the actual graphics card to go into power saving mode, as well as making sure it is the right card being used from the start.
Second, it can help if you disable the Intel graphics chip and then run the game. It might be a good test in any case. That should make it impossible for the actual graphics card to go into power saving mode, as well as making sure it is the right card being used from the start.