sounds like your belt that runs the tub might be getting loose , pull the washer out and remove the access panel in the back , look in and find the belt about midpoint of the long run of the belt between the pullys there should be 13MM of deflection ( flex). if there is more you'll have to find the tighitening point (usually the motor) and tighten it up hope this helps you
Nort73, March 2009