I burned COD 5 and I've only been playing it online. At the start it was fine, but up until yesterday it's been lagging a lot . I burned copies for my two friends and it works for them just fine.
Also, if one of my friends invites me to a game, they lag and if I invite them, I lag.
Any ideas? I have a Nintendo USB Wi-Fi connector and I think that could be the problem. I burned 2 copies and the both lag.