After turning off the Prius, here are my symptoms -- what is Prius trying to tell me? 1. Open door: constant beeping inside car begins. This beeping will continue until the door is closed. 2. Get out, close door: three beeps outside car 3. Remote for lock/unlock doors does not function; must use hard key to lock/unlock. THERE IS NO KEY IN CAR!! This happened once before and, after awhile, the behavior stopped and everything worked normally again, including the remote. Given these symptoms, what is a logical cause? Thanks!