UNPLUG THE WASHER ........ remove the small panel at the back and grab the motor see if it feels loose ? the mounting screws may have come loose... The other possible cause may be the bearings have gone to test this open the door place your fingers on the inside edge of the door seal near the drum now place your other four fingers flat on the inside edge of the drum and gently lift the drum up towards you if it moves more than an inch upwards then the bearings are worn and you"ll need a new rear half tub and a drum cheaper to buy a new washer
Barn, September 2006