You get banned for 60 minutes if you cancel searching for a match.
Happened 2 times now.
The game claims i were in a match both times, but no match were even found in the first place.
After 5-10 minutes of scanning for a match, you have to cancel.
Now you get banned because of slow matchmaking.
Note that this only happened in current Road to SI event. Haven't played any other mode last week.