On a tangential topic, I have had three KFC225 autopilot failures, with the pitch servo burning out each time, all over Le Mans. Specifically at a point about 5nm NE of the town. 2003, 2007, 2008 and the last two documented precisely with a GPS track log, within about a mile of each other.
A ground based missile guidance radar, most likely. I got Socata to check with the French military, who obviously denied they have anything there (there is a military area down there). I have a detailed writeup on this.