Should i be worry about this?
So i bought an used traktor audio 8 and it is giving me problems with traktor, when i plug it and play with it i get a rare interference like if the sound get disturbed, i have been reading and looking for a solution but i just get this thread of NI
https://support.native-instruments.com/hc/en-us/articles/211844685-OS-X-10-12-macOS-Sierra-Compatibility-News?_ga=2.235114505.92354138.1500611287-300769022.1495853730
maybe its my mac? should i downgrade the osx? or maybe its the broken audio card?
pds: sorry for my english 
What version of macOS are you on?
Also, try a different USB cable.
Check your latency settings in traktor. If your latency is set too small then you are putting more stress on the CPU which can often times make your audio sound terrible. Default latency is 512