Well, that's just it... it is not "widespread"... yet.
The keyboard has only been out for 3-4 months - so not "a lot" of playing time on the 88 version yet by most who bought them.
The 88 key version has not been available in the U.S. for some time now ("sold out") - my guess is their weren't a huge number of the 88 keys shipped...?
As the number of 88 keys sells - and the longer time people use them - the problem very well could become "widespread".
I don't know anything about Japanese business culture - but I sure would want to "investigate" the matter while it still was not "widespread" and hopefully nip the problem in the bud before it becomes "widespread" and hurts my company's name and sales.
Just my .02