This happened yesterday, once. I wasn't too concerned.
Today, after my computer has been restarted, it happen twice in a row. Giving me a 30 timer and a loss in LP.
Basically, it freezes on somoone slecting a ban or a champion, until the timer goes to 0, then it tells me that the other players have left the room. Then, I find myself back in the pre-queue.
It isn't my internet.
Don't want it back, or anything like that. I just thought you may want to look into. This is hurting players for no reason.
EDIT: Yey, it did it again. Now, I'm sitting at -23 LP in Bronze V. FML.