I am running OS X 10.9.3 and the latest Outlook for Mac.  After it is open for a random amount of time anywhere between a few seconds and a couple of minutes, Outlook becomes completely unresponsive to user input.  It does seem to still perform background tasks like getting the read/unread state of email, but it will not do anything in response to user input.  I have tried deleting my identity and recreating it, and the problem still happens.  My only option seems to be to force-quit Outlook and start it again, many times a day.  Suggestions?