sorry that my suggestions fall flat & can't help u. have u tried the FCCD thing yet?
changing to another brand(dvd drive) is a good idea. liteon is good.
JK, i think the only way for u (maybe) is to send it(disc) back to the shop & have it replaced. i wonder if region 1 disc of the same movie has the same problem.
wish i can help more. <img src="/ubbthreads/images/graemlins/disagree.gif" alt="" />