My Bose QCii headphone often fall out of noise cancellation when I use PDE on my iPad. Not every time but probably 50% of the time.

I select my move and press watch, I hear the beep, and the my headphones are clearly out of noice cancellation mode while the ads plays, and it stays that way for the movie.

I don’t rely on PDE because of this - I download movies and shows to watch instead on my own apps. Just curious if anyone else has this issue?