Very sorry to hear that you're having problems. Macs have had problems with GPUs in the past in Macbook Pros (2011 version?) where Apple has ended up replacing the entire insides (this happened recently on a friends 17" 2011).
But (knock on aluminum), I've had 4 macs since 2011 all without hardware problems.
But (knock on aluminum), I've had 4 macs since 2011 all without hardware problems.