Yes, it connected like a champion to my motorola V9 then it decided not to.
Tried deleting the phone and reinstalling it but nothing seemed to make it work then I shutdown the TomTom and came back to the car a couple of hours later and it connected straight away and then behaved flawlessly for weeks on end.
Now have an iPhone 3GS and it was a pain to get the TomTom to actually connect even though it went through all the motions and showed the iPhone as a phone it knew.
Next morning took it out the car and it magically connected as though there never was a problem and has been fine ever since.
I had this problem just the other day and it is a known problem. As said above do an update but also fully charge the TT and it seems to fix the problem.