I experience the same issue with my 2005 TL. It re-pairs automatically when you enter the vehicle, but when you hit the call button (after observing that the phone icon on the dash is lit, indicating a paired phone) and speak your number, the phone suddenly unpairs, and you hear: "No Phones have been found." So, you cancel out of HandsfreeLink and 20 seconds later, it re-pairs. I have two theories: Some sort of sleep mode on the phone to save the battery, or proximity of the phone to the car's system. Seems to work better when I take the phone out of side holster and place it on dash or in front of me. Such is the life of a beta tester. 🙂