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This makes me think that this is a design flaw in the transmission control software, which doesn't deal with oil temperatures below 100F, especially I'm not the only one who experiencing this. The issue affects many 3rd Gen IS-es through the manufacturing years.
i don't think this is widespread. other than the few anecdotal incidences that have popped up over the years here, a number of them are due to fluid changes done by indie shops or at home.
your car, as you had stated originally, perhaps was subject to abuse early in its life.
