I have an acekard 2.1 with the latest akaio firmware, and I never have had any problems with any game I have played since 6 months ago. I have a 4gb kingston microsdhc that I bought at newegg for around 10-15 bucks by the way. I play a LOT of mkds online and I have started to have freezes (the whole screen turns black, so I have nothing to do than to turn off my ds) when Im going from one race into another. I have been thinking that maybe my card have started to fail, so maybe I need to buy a new one. Or maybe I just have to reformat it and solve the problem. Any ideas about what could be the cause of these freezes?