It is very simple
All these washing machines suffer from the same problem the controller board after a while does not work normally. This is due to a manufacturing defect which means that after a random number of cycles (and therefore vibrations) the contacts of certain electronic components become random. And that produces a shutdown in the middle of the cycle.
Personally I had this problem and tried to solve it myself. I have explored a lot of technical forums. I ordered a second-hand controller card in England, I exchanged it with my original card, the machine was working for a while then the problem reappeared. There is no solution and even if you change the card with a new controller at a high price, your controller card will fail sooner or later.
It's a design or manufacturing quality issue at Samsung.
The only solution is to never buy back a Samsung washing machine again.
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