Timer in champion select bugs a lot..

Since the 6.* update implementing the new champion-select, I've run into a serieus issue. When I queue for a ranked game (solo Q or with friends) my client bugs out the entire time when we get into the champ-selectphase. It displays everyone leaving the room and ends up with me getting the time-punishment and losing LP or even worse, cancelling my promo's.

I've run repairs a couple of times now, but still end up having the same issues. I'm honestly running out of options & courage to do any more ranked games or even play League...