Minecraft Chat Bug

When I am in-game, the chat will eventually make it so that I cannot use the V, C, X, or Z key. And when I try to use the A key in the chat, it will highlight all the text that I have typed in the type bar, and when I press and key except the A key, all the text disappears. When I try to backspace on a character I have typed, it will backspace on an entire word. Please try to fix this bug ASAP.

Thanks!
BustedGiant