Servis 6003S Washing maching imbalance on drum assembly?

I have a servis washing machine 6003S 1300 spin model 5 KG
when it is washing and goes to do a fast spin the complete inner and outer drum moves about a lot and makes a loud clonking sound.
I have isolated the noise to the drum dampers
do the suspension dampers go faulty i.e lose pressure over time?
The dampers have a cover over them and when inner drum is spinning the damper cover is hitting the body of the rams if that makes sense