I have the same loud knocking noise randomly when doing laundry but my washing machine (WF45K6500AV/A2) goes one step further and does not finished the rinse and spin cycle. The timer goes down to about 5 then goes back up to 15 mins and it will do that non stop... my machine will run for hours before it stops. I called in for customer service and they told me it was definitely the filter. I cut my steel drain pan because I stack the washer and dryer to find that the filter had no blocking debris in it. Less than 2 years old and we have been dealing with this for over 8 months. Samsung, I need help. We are at wits end.
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