did the new update do anything to voice memos?

I have an iPhone 15 and I think it did something to voice memos. Shortly after I updated it, I was in new york and was seeing some theater. I record a little summary of my day on voice memos at a certain time each night, and so i ended up having to do it right before the show started. It sounded like you are hearing it through a wall, and I've done this before the update and it worked fine. This happened two nights in a row but sounded normal if i did it anywhere else. My phone's never had any problems before, so does anyone know what was happening?