Happened to me 4 or 5 times while using the unit at a gig Monday.
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There are a few users who have noted this, but nobody has confirmed whether they were able to resolve it by formatting the export device and re-exporting the tracks. Give that a try and see if it helps. Also, after formatting the drive, be sure to give it a different name from pre-format.
Even if the drive was formatted with the latest version of Rekordbox and the latest firmware? Both were fully updated before any exporting of tracks.
Worth trying.
No luck
I've got a ticket open with the engineers to try and address this.