Sure, I'd be happy to help you troubleshoot your Rekordbox playlist export issues. Here are some steps you can follow:

1. **Check the Version of Rekordbox**: Make sure you're using the latest version of Rekordbox. If not, update it to the latest version.

2. **Check the Format of Your Music Files**: Rekordbox supports a variety of formats like MP3, WAV, AIFF, ALAC, FLAC, etc. Make sure your music files are in a format that Rekordbox supports.

3. **Check the File Path**: If the file path of the music files is too long or contains special characters, it might cause issues. Try shortening the file path or removing special characters.

4. **Check the Storage Device**: If you're exporting the playlist to an external storage device, make sure the device is properly formatted and has enough space. Also, try using a different USB port or a different storage device to see if the problem persists.

5. **Re-analyze Files**: If your tracks are not exporting properly, try re-analyzing them in Rekordbox. You can do this by right-clicking on the track and selecting "Analyze".

6. **Reinstall Rekordbox**: If none of the above solutions work, you might want to consider reinstalling Rekordbox. Remember to back up your data before doing this.

If you're still having issues, you might want to contact Pioneer DJ's customer support for further assistance.