Tried the quick fixes found on Youtube. - center nut wasn't loose, solid bracket brace fix didn't work either. Waste of time.
Ran across spring support rods fix, and found some sites offering nonsamsung parts dirt cheap.
Decided not to fool around anymore, and ordered 4 Samsung OEM support rods from this site.
Watched Youtube video, and saw how easy it was to fix. Parts arrived in 2 days for $10 delivery charge. Washing machine hums like new with the OEM parts. Got our life back.
Don't fool around with cheap parts. For $150 we have our washer back, saving a repair guy bill of $500, or a brand new washer for $1100.
BIG TIP - only replace one spring rod at a time. Otherwise, the tub sags way down. School of hard knocks.