Keyboard Deactivates During Combat

[Avg8tor]

Over 400 hours into the game and suddenly I keep having an issue during combat where my keyboard deactivates. Mouse commands function normally, but keyboard is completely unresponsive. If I quit the game, the keyboard remains unresponsive until I reboot the computer. Nothing outwardly odd when I look at keyboard settings. Haven't made recent hardware changes.  Using an Alienware X17 R1, no alternate keyboards (saw someone had similar issue due to multiple language keyboards). Did not have the problem until 1.6.0.5, and it now happens about every 4 battles. Could be some combination of shift/alt/ctrl, but odd that it never happened in 400 hours. Anyone else seeing this behavior?