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If you're getting it in as favourite, you're doing nothing wrong. Losing with AA when all in pre flop is never a mistake. I'm no fan of the term "bad beat", but I guess that's what it is. Better would be to understand this as variance. You'll lose 20% of the time when you get AA all in pre flop vs one opponent, but you might lose three in a row. That's negative variance. You might also win ten in a row. That's positive variance. Over many hands, it averages to 80%.
If you're getting it in bad, then you might have made a mistake. It depends on your opponent's range. For example, getting in with KK against AA is fine, provided he can also have AK and QQ, which is a reasonable assumption. KK vs a range of QQ+ AK is a profitable all in, so when you run into AA, it's just bad luck.
Likewise, losing with the second nut flush is not a mistake, since your opponent could also have Q or J high flush, or sometimes worse. Over time, getting it in with the second nuts is going to be hugely profitable. But sometimes you lose.
The examples you give seem like bad luck, rather than mistakes.
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