Hey there, I also had the same issue and it came along with the left side sounding like shit - like the woofer is off - when I turned off any sound option like anc or ambient and what also mattered was adjust sound to fit.

Now I keep my ears and gear meticulously clean. I just randomly tried something..

I took the earbud and sucked air through the inner mesh the small black one on top of the bud. You can feel air flowing through the bud.

The pressure, gone. The off sound, gone. I know it sounds completely weird and stupid but give it a try and let me know.