Your antenna is about to die.
Well, not necessarily die, but it will likely break soon. Had it happen to mine a few months back. It's not too difficult to fix yourself (or you can spend a couple hundred to have the dealer fix it).
I can dig up instructions on the fix if you're interested in a DIY solution.
Dougjohn, as a newbie I would certainly be interested in your instruction set...esp. fixing one if you don't have to buy a new one!