I don't think it has directly to do with YLOD. Well, at least I never heard of it being a prelude to YLOD, and when my PS3 had one it came out of nowhere.But it could be an overheating issue, I never had that problem, but I read in a German forum one year ago that some people had the same problem and it's very likely that it has to do with overheating. The problems disappeared after changing the position of their PS3s and/or turning down the heat.
But I can't say for sure.
Edit: I saw, you found the problem 
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