When you join a server and leave it, maybe because the players on your team are toxic, and when you go back to menu, just after when you try to join match making, it sometimes does not allow you to join any other game until you let the estimated timer run up to a stupidly ridiculous wait time, and then it errors, and brings you back to the menu again.
Match making itself is also still very slow, and I know other non Ubi games who have implemented this same type of match making feature and players are match-made instantly. If others can do it, so can Ubi. Please fix this in a future patch.