I'm not sure why OP is being downvoted. Dominion has a big leaver/afk problem. Ignoring it won't make it go away. Winning a single 4v5 doesn't make it ok.
Low elo SR is also plagued with leavers. The entire game is imbalanced which is why there are nerfs and buffs every other week. The shop glitching on reconnect has been around since LoL first existed.