My 2004 Sonatas'a antenna is acting weird. Just wondering if anyone else has had this happen so I can figure how long it will take for the dealer to fix. When I turn on the radio, the antenna lifts up, as it should. However, after it lifts, it drops about 2 inches and then lifts back up, with a loud clang. Same thing when I shut the radio off, it drops all the way down, then lifts up a couple of inches before it drops back down, again with a loud clang. I made sure there were no obstructions in the trunk. Thanks for any/all help Brian