You get frozen on the loading screen going into games and after leaving games, only on console.
I'd say it happens once or twice every 10 games.
It still takes bus fare/counts as a game for a cup.
Reported multiple times on FortniteBR to no avail.
It's something we've been tracking for some time on our Trello https://trello.com/c/dqDfjlT5/1551-long-loading-screen-while-entering-exiting-a-match