Cant get into games [Client]
This is a problem with no actual way to reproduce other than trial and error.
While starting an Aram or Summoners Rift you will enter the queue as normally but when accepting the incoming game you maybe sent back to your team lobby and not in game lobby. You are not able to do anything until the game has started. Frequency of this happening seems rare. Happened maybe ten times, and worried these will count against me.
Aram does not remove you from game since champion has been preselected and the game will continue with you disconnected and no way to get in game. During this time you may spectate your game and see the unmoving corpse that is your champion. These are counted as leave games.
Summoners Rift will simply make you get a queue dodge from not selecting a champion, I do not know if it can happen in ranked queues.