I have a 2006 A4 2.0T quattro with technology package (bluetooth hands-free, but not the "cell phone package"). For the past 18 months the Bluetooth has worked flawlessly with my AT&T 2125 phone. Last week I took the car in for its 15K mile service and ever since I've been having problems with Bluetooth:

1) turn the car on and the Bluetooth connects to my phone
2) 30 seconds later the Bluetooth connection is broken

Is it possible my Audi dealer did a software / firmware upgrade during my 15K service that has messed up my Bluetooth?

 

Unlikely. For one, theres no updates for that system that i am aware of. Secondly, there would be a line added to your ro describing the update. Phones on the other hand are constantly being update, many times without customers even being aware of it. May want to contact your service provider and see what recent software updates have been performed to the phone.