I have a similar, but not identical problem. I saved a favorite (of buffolo springfield) but when I go to play it - no sound - other vids work on u tube, I can see the pictures move, I listened to it the first time that's why I saved it, but now -zilch - no big deal, but its a utube thing.
In Iplayer (BBC UK) after 1 hour I get no sound and have to log off and back on to get it back, other sound sources work its just the player


Win 11 64, Asus Rog Strix z390 mobo, 64 gig RAM, 8700k