What is strange flip flap noise?

[Ounerbouks]

I'm not talking about white noise

when you put your headphones in your ear, do you have no noise (like the sound of water, a litle flap flap) just enough time to handle them? I specify important, in anc high mode

or when they are in the ear, you put them in and you take them out, always in anc high.
It is the micro of the anc doing that I think?
I have so many bugs that I wonder if I should not trade them.
Battery that discharges itself, second bl connection each time I put them in the case

thanks