likely is that the dampers on the underside of the drum have failed. (they are like shock absorbers)
The drum is also suspended from a couple of springs, you also need to check these.
To check springs the lid needs to be removed.
There normally are 2 dampers attached to the drum and the frame.
They are accessed by tipping the machine onto its side.
However the machine is heavy and make sure you disconnect power and water if you want to investigate.
Cost of new dampers are around 50 each.
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