DDJ SR is Outputing Master on my Headphones

Hello, 

today my DDJ SR started to Output the Master Signal through my Headphones. I have working Speakers connected to the Master Output but the sound doesnt play through them. Instead, I get the full Master Output on my Headphones i would normally use to cue. I have no Idea why this randomly happened and I'm not able to fix it. I already reinstalled my Drivers, still the same issue. Hope someone can help.