If you have transferred MP3 files using your computer, those files may not be transferred in order of transfer because of system limitations. If you transfer MP3 files from your computer to the IC recorder one by one, you can display and play back the MP3 files in transferred order.
The file being recorded has reached the maximum size limit (1 GB for an MP3 file). Therefore it is automatically divided.
You need a certain amount of free space for a file management area to divide a file, therefore the remaining recording time will be shortened.