The drum is suspended on springs,unplug it,take the top off(cross head screws probably)see if springs are connected to casing,if they are tip it up and see if springs on the bottom are connected to casing(if a spring is dangling on one end it should be connected to the casing of the machine)if you are trying to wash Trainers or something heavy like that you shouldnt and you will have this problem,dont overload the machine,try it with a lighter load if the problem doesnt happen it means you are puppitn to much stuff in one go.
Rich
June 2006