[Client] Client Freezing After Failed Champion Select
In the Beta Client, if someone in your lobby dodges before ban phase is over, the client will freeze. This will make reloading the ready check much slower than usual, but the game will still find a match for you. Thus the client can end up loading too slowly for you to accept the ready check, and if you do manage to accept, you will be moved in to champ select past the declaration phase and into bans. In this scenario it is recommended that you instead decline the ready check and re-queue.
This is most likely related to the other Champ Select bug that others have been reporting.