Antenna receiving problem
 

Hey

I need some help.
I got a A4 cabriolet, original NAV, the one with DVD and SD slot.
And it has got a problem receiving FM radio,
in the beginning it was only on and off, but now it is all the time.
AM, TV and CD works fine, it is only FM.
I have tried to disconnect the antenna cable and plugged it back in, no changes.
Have any of you any experience in this subject?

Best regards
B767
low and fast