In regard to Kingdom Hearts and GTA Vice City i think that $ony have have added a new MOD CHIP DETECT routine that is very annoying !
You see it would be very easy to code a little routine that could detect the MAGIC 3 type of chips and instead of hanging the system or showing a warning sign they could be complete b.a.s.t.a.r.d.s. and at a random time it freezes.
This time could be a matter of minutes or hours, and installers do not test each game type for hours , we usually just give a test to see if each game type boots so only the end customer would notice the annoying freezing at random points !
just an idea guys !