My Bose is about the same age. I have had the same problem -- reached out to Bose CS about a year ago & frankly costly to repair.
Could be the "internal needle mechanism". My friend had her's fixed and same thing eventually happened.
The radio is fabulous and if I was tech savvy I'd see how to use Sirius or Pandora but I'm not so I'll just enjoy my fav radio stations.
(I'm sure you paid a lot of $$$ now these systems are really affordable -the way I look at it -- I've gotten my $$$s worth from 15+ years)