I found that i at times couldn't actually leave the game. I'd hit quit to desktop and it never happened. Couldn't even alt + F4 or nothing. Almost force shut down computer when i brought up task manager. That worked luckily. Also i'd go in matchmaking with friends and then they wouldn't end up in the same game as i did, or rather i found a match and they didnt
I found out that the button for leaving to desktop might be configured as hold button instead of press button, I had not troubles leaving the game once I started holding the button a couple of seconds, but It had to be first try, if I just pressed then it wouldn't work, at least I got that feeling, I didn't test it properly.