[bug] Actions interrupted and cursor changed to generic target reticle randomly this whole match

I just got out of an ARAM where I was Darius. During the match, anytime I would engage the enemy, after a couple of actions my cursor would change to a blue crosshair, and my character would stop attacking until I left-clicked the ground or something. I could not right-click out of it. So I'd go in, attack once, use an ability or something, and then my character would basically stand there until I fixed it or died. It was pretty miserable. I do not know what caused it -- all my abilities were set to quick cast, and my key bindings are all defaults. I even reset them in my settings during the match to make sure I hadn't accidentally changed a hotkey binding. Not fun.