So this has happened to me a couple of times in the last few days. (Only known to happen top lane so far as thats where I play/have observed the bug, I havent attempted to recreate it etc)
Occasionally when Quinn vaults to an enemy, partially over a wall eg, From near her tower in top lane to the brush in the river, as she vaults back and lands, she gets bugged in place and is unable to move. I dont know if its exclusive to top lane etc, but you just get frozen in place (similar to minion block) and unless you recast vault, flash, etc, seem to be stuck in place.
Just thought I'd post this, not sure if it has been covered elsewhere.