It sounds like the radio is not registered properly. Currently XM is running 60 channels for free until Sept 9. If it completely stops on the 10th you will know it is the radio registration with XM as the problem.
1982 FLT Virgin unmolested barn find.
1983 FXDG 80th Anniversary AKA Willie G Disc Glide, 10.5 to 1, Andrews B grind, 2002 Fat boy carb, Barnett Clutch, drag pipes.
2003 FLTSCI Black and Silver converted with Motor Trike Kit plus HD tour pak, 88 inch, HD 204 Cam, Vance & Hines mid shots.