I heard somthing in those lines too. The A1200's custom chips had some problems. But they were not corrected as they wanted to rush it out for christmas. I beleive later revisions of the board have less patch wiring but still have custom chip problems. They left it in (no money to fix it) because it was not that much of a problem....until you accelerate beyond 030's.
something like that.
the a4000 is also a design that won the day because it could be rushed out sooner (and cheaper ofcourse)