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I've noticed it's better if I keep the machine off when I'm not using it and/or it's actiing up, which points to thermal issues, as you note. I've also notice it's tied to YouTube (maybe that's a separate issue) but I also find a lot of YouTube issues with FireFox, as well as Flash.

So, at least I think I can keep it up and limping, but I do need to replace it - obviously some chipset is screwed. One complaint from the machine is that a certain clock interrupt (not always) isn't received in time, and it hoses up. Not always, but everything points to thermal. I've had it for a few years - upgraded the memory and hard drive (to SSD) but there's obviously something else going wrong. In addition, if I run the manufacturer chip tests, it invariably dies, which is not a good sign . So I'm going to keep it limping until I can move to some fresher chips, preferably in a desktop where I don't have to replace the whole damned bunch in a problem.