I tried two SDJ1 with the same problem when rest 10 seconds to finish the song, the sound stop 0.5 seconds and them continue to finish the song, the card is a 1 gig that become with the unit, the mp3 files are a VBR and 320kb, anybody know something or happend the same?. Maybe that the sd card is so slower?. Thanks.

I will check on this, but if my memory serves me VBR files were not officially supported, just CBR. Due to the nature of VBR files it takes allot more processing power, and they are more suseptible to errors, You can check some popular DJ software apps forums ,and find plenty of threads about VBR issues, some DJ software apps don't even support VBR at all. Can you try playback with CBR's and let us know if you experience the same issue?