The games has frozen two times in a row while playing the level Stronghold. 

The first time the visuals froze while exploring the Stronghold, before entering the portal. The game music continued but we couldnt do anything. The Nintendo Switch continued to function and we had to close the game.

The second time it froze while in The End. The same issue happened.

These are the only times the game had frozen, and we have already finished the Arch Illager in two difficulties and also have played the Ancient Hunt without any problem. 

A friend of ours also reported that their game frozen while entering the Portal to The End.