Check the springs that secure the internal part of the machine to the outer frame, make sure they are all still attached or unbroken.
or
Can you 'rock' the drum with your hands, if so, you may have bearing wear & therefore the drum will not spin in a central position & the machine will become unstable during the spin cycle.
or
Have you moved house recently & forgotten to remove the 'transit bracket'? This will make the machine rigid.
hope this helps!
mark
May 2004