[CRASH] Game ignores all keyboard input, except enter key and space. Also fully able to chat ingame.

This has happened to me multiple times and it is incredibly frustrating causing me to lose almost every game in which it has happened. The title describes it pretty well, I load into the game like normal and everything works except for my keyboard input. So basically I can run around and refocus the camera on me and chat. To finish these games I either need to play with my mouse only or restart my computer and log back into the game, by which point we have normally lost. The odd fact in this is that I CAN talk normally in chat, it accepts my keyboard input like normal upon entering chat but outside of chat I can't do anything. Please fix this ASAP. I can't risk entering Ranked games and can't enjoy normal games. It sucks.