I have no idea. I bought the play on gamecube memory card. 4mb from toys r us. It was the only one there at the moment. I don't know of the quality, but it was 10 bucks. It could be why. Does anyone have any? or have this particular brand?
If not, are you guys using the official nintendo memory? Or what other good brand is there? I never had a gc, so I have no idea.