Sometimes I'm a little hard with my DSi - I have a tendency to slam it shut sometimes, and the entire system will shut off. This doesn't happen with retail cards, only when my Acekard2i is running. Also, whenever my DSi is shut running the Acekard2i for a while I'll open it back up and it will be frozen. I know I have the latest firmware as I just downloaded it off the website. Is there something wrong with my acekard? other than that, it works perfectly.