Zero-G Beats Working In Cuba problem.

I’m using zero-g Beats Working In Cuba library with kontakt 4.2 and sonar x1a and sometimes the instruments (loops) do sound and sometimes dont. I look at the individual instruments inside kontakt and when they do actually work the midi signal twinkles several times but when it doesn’t work it just twinkle a soon as the midi note plays and then this would stop and nothing would sound. I think it’s a midi problem and it’s driving me crazy. Please Help!