This usually happens when the game soft-locks, after a communication error (unable to sign in) or randomly.
I do not have any screenshots right now, but at this moment that i'm making this report, my Switch is currently freezed.
I really don't understand how can a game like Minecraft temporarily freeze an entire Nintendo Switch console.
Related issues
Comments


a fix i found is to hold down power button for 12 seconds to shut down system.
We're already tracking this issue at MCPE-95621, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature, to see if the issue has already been mentioned.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki
This happend to me too