Created a folder on SD card, then added song data from a mixer play back 1 song at a time. The 3rd song seemed to write and save ok. Looking at the song folder contents it shows 0 data recorded. The other two songs show song size data. Removed the SD card and plugged into a computer. the .wav file data for the 3rd song was present. The SD card is a 32GB card. Firmware is 5.03 beta