Noise from USB connection to Pc with Ur824

Looking for advice on using 1/4" TS cables from mixing board channel inserts plugged half way to UR824. This is causing ground noise with USB plugged in. If I use a Xlr y splitter from the snake then into board and other to ur824 it is clean. Hear a pin drop clean. Is there a solution for the insert 1/4" method. It is much cheaper