things I would check that I always do to be safe
delete any album artwork as a test, i keep hearing beatport issues and it's most of the time related to artwork
Check the file and make sure it is a CBR, not VBR. You can look at this in itunes or in the properties of the track. For instance mp3 cbr is usually 192, 256, 320 for the most part, if you see something weird like 252 for example, it's usually a VBR. CDJ's cannot properly play VBR files without freezings or being very slow at times, they are not officially supported