My 2-day-old HR44-700 is having an odd Caller ID issue. When the phone is in use, every few minutes it flashes "Caller ID - Caller Unavailible". I can confirm there's no 2nd call coming in. Caller ID worked fine with the same jack when it was going into my older HR24. Not only that, but I don't even think my local caller ID service indicates when there's a second call coming in. Any ideas on how to fix these ghost calls?