Did not try in sport mode but in Normal mode I can hold left stick all the way down it lands okay but then when I bring both sticks to full down and inside or full down and outside, doesn, matter, it trys to yaw and bank like its still flying but with lower rpm like whn you first start up.
I just landed in grass so it wouldnt get beat up on cement and just kept holding sticks down and out and eventuall it shut down but this is not normal it has acted correctly in the past.

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