Intermittently the keyboard does not function when attempting to type in the chat window. Likewise when this happens I cannot mail anything to other players.
The Keyboard functions during combat continue to work properly, but typing commands, chat, or anything else simply does not work at all. The only way I could get typing back was by quitting the game and relogging. That worked, but for only a relatively short time.
This has happened to me this evening twice.