You might have weak shocks, or just a weak floor. Try replacing the shocks, or just adjust the feet to ensure they all are making contact with the floor.
If this dosn't work, you might have to strengthen the floor with a 1 inch piece of plywood screwed down.

I assumed you had a front loader as your model # doesn't work.
If a top loader, remove the outer panel and check the skateboard under the tub, probably got jarred out of place or the brown plastic slides are worn out.
Also check for a bad/missing spring.

I have a customer that had a similar problem and everything looked in place but I did find two pins that had fallen into cups below them. They looked like thick nails with holes toward the points where a cotter pin should be. There were holes in the base and the middle plate that the pins fit into exactly. I put them through and put copper wire through the hole to hold them in place. Now I'm just waiting to hear from the customer how it worked. The schematic does not show the pins.