Que drop and auto fill

I think there should be a guarantee of selected roles if the que you were currently in drops. Instead what happens if a que drops and instantly ques up again is that you get auto filled so something you did not select for. After waiting for more than 25 minutes and having 4 games dodged out of champ select i finally get into a game as support when i did not que for support. If i didnt care about roles i would choose blind but in choosing draft and the option to choose roles is there, there should definitely be a change on how you guys choose roles and how to better maintain que times.