DDJ-REV5

The other day, I’m practicing for a gig in the afternoon and the mixer is working fine. Get to the gig and only half the mixer is working. If I used USB B, the left side of the deck worked but not the right and vice-versa. The side that isn’t working is showing ‘IN USE’. I updated the Mac firmware to the latest version as well as Serato DJ Pro to the latest version and still nothing. Any help would be appreciated. Thanks!