There's a MAJOR bug on Minecraft Bedrock (specifically on the Switch) were when your playing the game it randomly freezes on a frame of the game for an extended period of time and makes the music buffer like a broken record. The game still seems to be running because mobs can still kill you and the night/day cycle changes after it stops. It can even freeze the console itself! I'm not sure why it happens exactly but, it needs to be fixed soon.
Thanks for your report! However, this issue is very common and has already been reported (MCPE-41479.) If you have anything to add to the conversation please comment there. Also, make sure to search for an issue before making a ticket. Have a great day! 😃