Frankly, Samsung CS are not that good in handling customer complain.
Last month I asked regarding the back cover where newer batch got 2 while earlier only got 1, actually I thought they might inform like those with serial n.o starting from (example ABCXXX) got 2.
Kind of frustrated when they ask me to go back to the dealer, even though I informed maybe the dealer cheated me?

As for the SOD matter, Samsung should have conducted testing by themselves since many users complained, not by requesting to send back unless they think this matter is just isolated case.