Reply to HALP. My soundcard is buzzing?! 2 Xone K2's

Hopefully you guys can help me! I have 2 K2's set as an aggregated soundcard on my computer and today I got a terrible humming when I plugged either of them in. I have had this problem before in the past and fixed it by sheer luck. I want to know what is causing this problem and figure out how I can make it stop! I Play clubs a lot and I don't want this to happen to me there; unless I know how to fix the problem

I have heard that sometimes there are latency problems that cause this to happen. Or probelms with the ground, I'm Just not sure what is going on :/

Also when I play a track in traktor it sounds distorted! PLEASE HELP? :]