PBE dodgers
The dodge system needs attention for the PBE. Whenever a big patch or one that has a new champion is released the que times go on for hours. The primary reason is dodgers (The secondary would be the ones who afk during loading to get the match cancelled). They will log in with the idea of playing the new champion only. This causes problems. The PBE is for testing out the new patches for Riot to make changes before they go live. This becomes increasingly difficult to do. There are many things that need to be tested!
My suggestion would be to increase the time punishment for dodges. Now I don't run any game companies or have the stats but something needs to happen. Please leave your ideas or simply upvote to support a change if find this to be an issue as well.