Removable AHK ball head wobbles

I have this problem with my abn. Ahk's shaking the head of the bullet.
You're gonna make it happen, especially to whom a hanger is on, but even without pulling it right back and forth.
The movement is not to be noticed in the mm range, however.The game is only in driving direction of the car to the right and left not.
Have already mounted another ball head is similar.
Is the lead on the carrier worn out now or how?
Clean is everything and the phenomenon was not always
An idea?