Not really. It's a cause. But it's also fairly clear given there are key clusters that are more likely to fail that it's heat related sometimes too.

There's probably not a single cause. And indeed, some of the fixes are probably making some of the other issues worse (I would not be at all surprised if the dust membrane is exacerbating the heat issues, and that's why the issues with the MacBook Air are just as bad if not worse than the other machines).