Hoping this covers my issues with an early 2013 retina - the system crashes whenever I let it use the discrete graphics, and it's got to the point that I can't

Hoping this covers my issues with an early 2013 retina - the system crashes whenever I let it use the discrete graphics, and it's got to the point that I can't let it sleep or power down or it's touch and go whether it comes back. I currently use a combination of NoSleep, gfxCardStatus and blind hope to keep it going.