Reply to Traktor audio crackling

I need some help with my audio for traktor pro 2. I am using a external sound card (audiobox 44vsl) for my cues and also the internal sound card from my desktop. the crackling starts when im near an end of a song, any song. my computer is not spiking with the cpu or memory. I updated my bios to the latest version. when i check my latency from traktor its sits around 43 to 54 ms. there is nothing on that is making the computer latency spike either. i can only make it stop by reseting the sample rate to 44100hz during a session. does anyone else know how to get around this?

Thank you