Whether it's intentional or not, it's something caused on your end and effects the other players just the same. Riot does not remove Leaver penalties, so you need to take steps to fix recurring power issues, your computer, or avoid whatever the issue might be. If you're unable or unwilling to fix it and continue to play while it happens then you'll continue to get increasing Low Priority Queues (up to 20 minutes for 5 games). https://support.riotgames.com/hc/en-us/articles/201752714-LeaverBuster-FAQ
If you need assistance with game/client errors or just need some advice on dealing with one of those problems, I recommend posting on the Help & Support board.