I purchased a new DS a month ago, and also purchased new R4 with 8GB micro SD card a week ago. Copied new firmware (v1.19) and few games (.nds). After playing for few minutes screen freezes with "Loading" sign. Even when re-started, Loading sign remains forever. When I insert the micro SD back in Computer, I cannot explore the files, I have to re-format and load all files (firmware and games etc) to have the R4 work. Even after re-formating and re-loading the files, the problem exists. Please help me.