CANNOT AUTO ATTACK ZED BUG

The game was running fine until after I got a triple kill top lane. I went to god mid and I couldn't auto attack. I could not even hold a and left click, it wouldn't work. I would just stand there. My connection was fine, I was able to do everything else perfectly, no lag, nothing wrong, except auto attack. my mouse was working perfectly on my desktop and in game except for auto attack... I was on zed who relies on auto attacks as much as his abilities. I had to relog in the the game a few times, then when that didn't work, I reset my pc, and finally it corrected itself.