At times, the game stops accepting keyboard commands (can't use hotkeys), and Pressing <Enter> key minimizies/maximizes the game. When this happens, I can click in the chatbox and type messages. Pressing enter at that point sends the chat and minimizes the game. I swapped out the keyboard with another I have on hand, and even purchased a new keyboard, but the problem persists. Logging out and logging back in fixes the issue.