I have the same problem, and am sick of it. I have had the machine for several years, and didn't realize where the flakes of gunk were coming from. I have spend a lot of money on washing machine cleaning tablets and the hot water used with the self-cleaning cycle. My latest situation I have ran the machine at least 8 times (twice with the cleaning tabs) and I have yet to get a cycle with no gunk left over. I will not buy or recommend a Samsung washer again.
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