It's crazy but it works!go to root of SD card. Atmosphere -> conents -> erpt_reports and delete the contents in that folder...
problem solved!!!
Thanks, man!
Maybe, that's happen because a lot of files going in there and where it tries to save another one, it crashes. If you are using FAT32 format, it can hold up to 65536 files but it can crash with a lot less deppending of the files. My folder had 16383 files.