Airplay data dropouts bug or not?

Hello,
I am investigating one problem with airplay streaming involved in signal chain. Longer story is here
Short story is that it began from shairport-sync issues. But i got same problems without shairport-sync involved.And that is just mind blowing. I played 20khz sine signal from mac to airport extreme latest version and firmware and got the same crackling sound due to dropouts about 384 samples lenght. I am out of ideas, so want to be more sure that not only me getting this. Anyone having apple at both ends could test this. Just generate 20khz sine over airplay to other apple end and see if you experiencing this. Why 20khz? Because this is the most easy way to find a problem if it exist. Make sine just below 0dbFs and play. Please play for 2minutes at least. The problem could take time to appear.
Anyone experiencing the same please let me know.

Thanks
 

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