Strange, the problem occurred on my rMBP 2012 right after I upgraded to Yosemite (literally the same day). I also thought it was more of a software bug, so I downgraded to Mavericks. I still had the issue on Mavericks, so I thought it was a just a coincidence. Also, at that time, Apple wasn't aware of the problem and I wasn't on Apple Care, so they didn't want to test more my laptop. The only option was a straight 600 bucks repair... I still find it really strange that a lot of us had this problem after a software upgrade...
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