Hello, I bought the rMBP 15" 3 months ago. Yesterday, while on the train I felt warm in the laptop bag when I tried to take my phone out from the pocket. Thirty minutes later when I arrived home and took out my laptop, the rMBP was very hot. It was so hot that I could not use it. I could get burned placing my hands on the speaker. The Speck case became soft. It was really scary. I turned off the laptop immediately and the issue disappeared. Anybody knows what was going on? Is that a sign that the battery is failing?