Gamecube ISO help

Hi. i've suscessfully modded my Wii to play burned gamecube games and I realized that some games won't work. The ones that doen't work for me is 007 Nightfire (disk error, please take out and reinsert disk), Baktin Kaitos Origins (freezes at random parts during the begging). Plenty of my other games work though. I was wonderiing if thats some anti piracy measure those games use or am i doing somthing wrong. I use neogamma backup loader and the game cube backup launcher.

There is no anti piracy on those-infact I got nightfire (although mine is PAL version) working.What burn speed did you use, brand of disc, and was it + or - type?Disc size is not important.