We have a Miele Novatronic W918 (New Zealand, model number may be different from US) washing machine, which has now given sterling service for about 14 years. Recently is has developed an intermittent but alarming symptom, which only seems to occur when a particular combination of four bathroom towels are being washed by themselves.
At certain points in the cycle, when the drum is changing direction at slow speed, a number of very violent bangs occur, with associated jolts that may physically move the machine on the floor. The severity of this activity seems to be worsening, and is enough to frighten the dog!
It seems to indicate an imbalance problem, although the four towels concerned are not overly bulky, and whenever I look into the drum, they always seem reasonably evenly distributed. When I spin the empty drum passively, there is smooth running, and I cannot induce any banging if I shake the drum on its suspension. During all other (more loaded) washing cycles, there is no problem.
I am aware that there is a weighted balance system on these washers, but I do not understand how they work. The violence of the aberrant movement makes me wonder whether some weight could have come loose, but if that was the case, I would expect it to be evident at other random times.......?
I would appreciate any thoughts or suggestions on what this problem might be, and what if anything I can do to check or remedy it.