Disk brake rotor feels loose
For future people who might have the same problem described:

Okay I have figured it out with the help of my local bikestore.
Turns out the whole wheel was a little bit lose.
After taking apart the wheel it turns out the so called locknut or what seemed like the lock nut  has untightend itself
After taking off the casette and everything else in the way and after tightening the lock nut the problem was solved and the wheel back in place