Reply to Traktor S4 - Fade Out

Noob question here... I'm using Fade Out points in some songs and when the song reaches that point, the other deck plays, but the original deck continues playing too. How do I make it so the song that is playing originally stops once it reaches the Fade Out (and Deck B starts)? Is it a setting? It used to work this way but now I am forced to kill Deck A volume instead.