Champ Selection Freez

Sometimes when an another player delay to select its champion the selection screen freeze and his counter lock at zero. Then nothing happen : can't click nowhere, no button apear, no champ selection possibility and I get ejected for 5 mn because I didn't select a champ which I couldn't do. It happened to me two times when I was last to pik of my team and the freezing happenned on the 3rd player of my team both times.