I have a 55 Audi A4 2.0T with a stage 1 Revo map. It has had an intermittent problem where my built in Bluetooth hands-free would get stuck on call mode. However I could turn my iPhone Bluetooth off and clear the problem. This week, once again it got stuck on CALL. However nothing worked this time and when I came out from work my car only just started as it was obviously draining the battery. So, when I got home I disconnected the battery for ten minutes and once reconnected it has finally cleared.
However, it's still not right. And to make it worse my car seems to have gone into some safe mode. It's very slow, slower than standard and seems to be restricted?