Failing to connect to a match counts as leaving. I don’t know where you’re located, but some regions have two servers where your connection may not be as optimal to one as the other.
More info here: Leaver Penalties and Technical Issues - #4 by Drakuloth
This is a very common misconception. Your connections to those other services are unrelated to your connection to game servers.
More info here: Common Technical Issues and Solutions - #23 by Drakuloth