Reply to Problems with the S4 (Buttons, jogwheels not functioning right)

Hello my friends,
I'm using an S4 for a pretty long time now, never had any problems. But now i have a problem, so i just runned the wizard, chose a S4 and so on. Working fine, but after a while when i use my left jogwheel it controls the tempo of the song. And when i press on play, my track won't start, but the tempo slider goes to the minimum. The right side of my S4 keeps working just fine! I need help...

Traktor S4
Macbook Pro
That's all what's important i believe

Already thanks my friends,

Grtz, Alpha Vision