I had the same issue, they fixed it without 2 days without discussion though. A motherboard replacement was required there, billed out for about $800 (of course for me it was free).

After all I'm still glad having a macbook. Friend of mine bought a $2.5k lenovo that bricked itself after a month, after having serious thermal management problems (the GPU would suddenly clock down). It took them more than six weeks to get him a replacement.