Toxic Teams/Queue Dodging
After all these years the various aspects of the leaverbuster system are still completely mismanaged. While queue dodging can be annoying, and there should be limits in place, it's much better for everyone of people are allowed to dodge to some degree rather than forced to play games they don't want to play. If someone wants to be angry and salty about not calling ADC first, I'd rather they just dodge than play the game and grief the entire time. If they dodge they wasted one minute of my time and it isn't memorable, if they ruin the game they wasted 20-30+ minutes of my time and ruined my game experience.
Likewise, there were times when the random party was acting so toxic in champion select that I chose to dodge. If the team is screaming at each other before the game even starts, that is not an indicator that following game will be a wonderful experience. Better to do everyone a favor and dodge, so that we can go our separate ways and start over. Which would be fine, except that the punishment for queue-dodging, whether purposefully leaving or getting disconnected or the client freezing up, scales very quickly. The five minute wait after dodging is a perfectly adequate restriction, it will make a person a person weigh the options, to wait between game attempts or play with a toxic team. When you scale the punishment up each time they dodge in a day, it quickly gets to the point where it's no longer worth trying to play. No one is going to sit there and wait an hour between games.
On a side note, it's also kind of an issue that the only button to report toxic players is in the post-game screen. What if they're being toxic before the game even starts and then someone leaves? What if the client crashes after the game ends, or you're just so frustrated that you accidently skip past it? A pre-game report button that also gives you the option to dodge without being punished would go a long way toward solving these issues. Some people would abuse it, but people can already file false reports just because they don't like people and I'm sure you have a way to deal with that.
TLDR: The system sucks. Punish toxic people, not players trying to avoid toxic people. And don't punish us for your client issues.