My son has been playing happily on her ds lite with the r4 card up until today - he played a game boy advance on his ds lite and after finishing playing the game boy advance game he tried playing his r4 card - the r4 card will no longer load. Can anyone help as to why the r4 card will no longer play on his ds lite (the r4 card is able to load on another ds lite without any problems so it looks like the problems is with his ds lite)