HOOVER WDXOC 485A Washer Dryer

The way the washing machine is rocking from side to side it does appear as though it isn't totally level. Double check that it is level from side to side as well as front to back and that it can't be rocked even a small amount on the feet. If the drum weights are loose it tends to cause a knocking noise. It does look as if it could be an uneven load combined with the feet not been hundred percent level. Does it do this on every load no matter what is inside? Loads that are likely to cause this type of vibration are usually relatively small loads with a mix of one or two heavy items that soak up a lot of water and a lot of lighter items that don't soak up much water. These can make the load unbalanced. Examples of this might be a load of laundry with just one or two towels inside, or bath mats, or one hoody mixed in with lighter items.

If it definitely isn't anything to do with any of this then it is very unusual if it is only a few months old.