Champ select inconsistently won't let me ban, kicks me and counts it as a dodge

In champ select both old and new, I've had instances where I was up to ban, but the client "froze" (all animations going but no progress through states) showing the previous banner had 0 seconds left. This continues until my ban time runs out and I'm kicked back to lobby.

Best I can remember about the most recent instance is that I was last ban, the previous banner had hovered Kog'Maw, and my intent pick was Bard. I'm not sure how much of that is relevant, but hopefully it helps.