What should you do if the Nintendo Switch automatically ends the game?

I was playing the Nintendo Switch Sword Art Online: Fatal Bullet until the switch suddenly ended the game due to an error. For a long time it went without problems. Now the game can no longer be started. The games that I have on the switch without a card still work.

How can this happen and what can I do?

Sh! T happens
… Start crying

Blow the card out and blow it back in. Was always a myth in the past, I don't know if it really intended something but try it 😂