Macbook Pro keyboard sticky keys bug

Hello!
I have macbook pro retina 13" (Late 2013) and from time to time my keyboard suddenly starts to repeat last pressed keys, writing a pattern like a "AbcAbcAbcAbcAbcAbcAbcAbcAbcAbcAbcAbcAbcAbcAbc" in occasions, when I wanted to write "Abcdef". I have never spilled liquids on my keyboard or something else.
I haven't found any pages and discussions with the same problem and solutions for it.

You have already done the "standard" troubleshooting approaches. As much as you hate to take it in, I think that is your best option.
Barry

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