I don't know if you've already seen this issue, but it has been happening to me since the newest version of Minecraft was released on the Switch. I have problems where every time I create a new world, open up a chest, check my inventory, or do anything that involves menus, the game just starts loading for 5 to 30 seconds. It's really annoying to me because I only get a limited amount of time to play Minecraft with my friend, and when I'm the only one who has this problem, it really stinks. I'm pretty sure it happens much more when you're in another person's world, but I can't be sure since I can't create my own world to test this. If you could fix this as soon as possible, that would be really appreciated.