I bought an '06 A6 Avant that had been in an accident but has since been repaired. I noticed something was different with the radio when I went to the AM band and it jump every 10 (1330, 1340, 1350). it seems to pick random frequencies instead (1327, 1338, 1343 etc.). I also noticed a Longwave (LW) option. When I select that it is down in the low 100 range but there are no channels available. Did my radio get replaced with a European model? My A3 I sold before this car didn't have that option and AM seemed to work as expected. Any info would be appreciated. Thanks.