I have a Comfort II with the latest firmware installed (just upgraded it). I have this odd behavior that when I go into the menu system, it often repeats itself. For example, if I go to listen to a message it will say "Monday, Monday, Monday, Monday" and then the message.
Likewise if I go into Security Test menu (F+3) and then press 1 for battery test, it will just say "One, One, One" and not actually go into battery test mode.