So I took my XF in for a service and they couldnt find the problem. They said they'll have to have the car the whole day to strip out the seats, carpets, dash etc. The mechanic asked me if I had a satelite tracking device installed becasue it can give problems in the wiring. So I went to Tracker (the sat tracking place that installed my unit) and had them check it out. Now my radio's working again! Ha!!