I’m frustrated

Bad Sound Static Feed Back with my 4TRAK

Hi There, so I work in a club as a Dj and the mixer I use is the Numark 4 Trak with Traktor Pro 2 software. Everytime I run my Numark 4trak for about an hour, a static / crackling/ popping feedback sound starts. The problem only goes away if i power down the 4trak, then start it again. It comes through my headphones as well, so i can rule out the speakers.
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