If the noise has become more noticeable over time, the sounds may indicate a wear problem with the drum bearings. If you suspect the drum bearings are worn, it is wise to repair them as soon as possible. Worn drum bearings can affect other parts of the washer. If the bearings are faulty, the drum may feel loose. Wear is also indicated by brown rust stains on the back of the drum. Read more: http://www.ehow.com/info_12135325_bosch-axxis-washing-machine-noises.html#ixzz2lrPgb7Rc
Or it could be the drumbelt. It may be worn and loose.
