Last time mine showed the Red Rings was the day the Crimson Map Pack came out for Halo 4. It got a little too hot and shut off in the middle of a match on Harvest.
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I bought my xBox Elite from half.com, in early 2010. As soon as I turned it on, ir RRoD'd. I e-mailed the seller, sent it back, and he sent me a replacement, and I've never had a problem since. And I, too often, turn it on, and leave it on without using it, for hours. I tend to space out and forget I have an xBox once I turn it on.