Mac Client Bug - Unable to Left-Click

Recently, occasionally after starting a game and spawning in, the game will not let me use my left mouse button unless i press it multiple times in quick succession. Along with this, the game will not allow me to manually move my screen by moving my mouse to the edges of the screen. Instead, if i want the camera to move with my champion, i have to play with a locked screen. This has been occuring for about a week and only once per day (3-5 games). However, today it happened in 2 games back to back. Not sure if this will help, but it has only happened when i play AD carry. This maybe be related or it could be a coincidence since i play adc in the majority of my games. I play on Mac OS X version 10.9.5