The moral is: Never leave two old Volvos sitting side by side in a garage. They do, indeed, talk to each other and find interesting ways to annoy their owner. My 940 and 960 have recently been conferring and have made every radio mast in the house inoperative. I have now spent two afternoons changing components on radio masts, trying to find one that will work, first on the 960 and then on the 940. I now have five masts and none of them work! I am looking at one of the beasts as I write this and I swear it is frowning at me.