If the coupler was broken the unit would not spin. Do you feel vibration in the floor when it is spinning?

Thanks for your replies. I guess it's not the coupler then, cause it can still spin at this point. It shakes so bad now, it usually moves across the floor a couple inches. All feet are on the floor. The only time it sounds better is if we run an extremely small load- of say only a few items. I know it sounds like a classic imbalanced load of items, but we are very careful about that, since the noise and moving across the floor began. This washer is supposed to be capable of a super large load of clothes.