I have a few problems with my R4 crashing: 1. Sometimes when I close the lid and reopen it, it's crashed and nothing responds. 2. Sometimes when I'm playing Worms Open Warfare 2 (only game I'm playing on it at the mo) it sometimes randomly crashes. I restart the DS and the R4 is not detected. My R4 has been slowly getting less responsive. I frequently have to blow on the connecters to get it working which oddly is only required when I remove my Micro SD card. None of these problems occur with normal carts. I'm using a 1GB Sandisk Ultra II card.