Sync

[carlosonair]

On some songs when you hit the sync button while playing the track - it can jump. Only sometimes while in the middle of a perfect mix you hit the sync button and it skips to another part of the song out of beat!!

[DJ A. J. Slye]

It sounds like the computer may be having trouble calculating a variable bitrate file properly, and then the sync goes out of whack because of it, or maybe just your getting computational glitches from time to time, if it only happens randomly that would be kinda hard to track down in the software, but if it's always with the same files or within a certin amount of up time for the software then it would be allot easier to figure out.