You can tell that a connection is dropped and the game makes no attempt to reopen a connection. This may be server side or client side, but I am certain that it happens far too often for it to be my ISP or other connection.
Please enhance the game to attempt to reconnect, or perhaps to discount exited games if it's a known server crash. I just played 3 ranked placement games in a row that crashed, and I'm going to be screwed. I'm a paying customer who was gold or plat ranked last season, and it is going to be hell starting from bronze.