I've noticed that when I get close to my local Airport ACC on my 2012 XC60 will turn itself off until I get a certain distance away and then I can turn it back on. It only seems to happen near airfields and Airports. I do have the Nav system so it is conceivable the car is disabling the radar near Airports so as not to interfere with airplanes. Nothing in the manual about this and a Google search did not turn up anything. Coincidence?