[R/+9]

Well, are u sure that ur mod chip has been fully installed did u go through the proper boot setup, your gameshark could have a fault (*im just going over the basics because sometimes i have missed out important stuff) if u have done everything right, it must be the copied games, have they been ripped?
if so or if not it must be them.
Try going over the burning again at a slower speed.

hope this is a help