[CLIENT] 'Lock In' grayed out, but everything else is working

I queued for a ranked match. I was in champ select for a ranked game and was able to choose my champion and waited for my turn to lock in. However, when it did fall on me, I was unable to press the lock in button and was forced to watch as the countdown timer went down before I was kick and leaver bustered as if I had chosen actively not to log in. The rest of the client is still functioning fine and there was no lapse in my internet, so I'm not sure why this occurred. It's something I've only experienced this once and I played several games directly before that champ select without issue. I did not close or update the client in between.