I just bought a new TT 730 and did all the online upgrades. It's very nice except that the FM transmitter stops transmitting after a seemingly random number of seconds, e.g. 10 to 60 seconds. This causes the car stereo to play the regular loud noise of static. When I go back to the menu to select the FM transmitter again then it's already selected (even though it's not working) and if I click on 'Done' then it does start working again but, again, will cut out after so many seconds... please help!