This appears to be an overheating issue, but I don't understand why. Playing Diablo 3 -and I've only seen it happen with that game- after a relatively short time (~15 mins) my rMBP will suddenly log me out. Shutting down due to thermal limits being reached would make more sense, but this just logs me out. I've ramped the resolution down to minimum and capped frame rate at 60 fps but it makes no difference: ~15 mins into playing I get logged out. I'm especially surprised as I don't have these problems on a similarly specced (i7 Haswell) MS Surface Pro 3: sure it gets warm but it keeps going. And the SP3 only has integrated graphics whereas my rMBP has a dedicated gpu. Any idea why this happens? Is it perhaps due to difference in Windows versus OS X graphics drivers?