I'm running Traktor Pro 3.11.1 17 with a Focusrite Scarlett 4i4 3rd gen. When I load a track into either deck an press play, playback proceeds as normal. However, If I remove my headphone from the headphone port on the front of the 4i4. Playback stops and then waveform on the deck ceases to scroll. What is going on? How can I avoid this?