Did you call them and ask them to reset or resend the signal to your device?
We don't have a problem at all with their audio. We have it in my car and we have it on our phones so we can listen to it at home with Bluetooth. We listened solely to XM on our seven-day trip from the west coast to the east coast and had no problems, well, other than an occasional losing the signal for a few seconds when we'd be in a really remote area. But on the major interstates and major state highways, we were just fine.
My preset stations that I listen to most are the '70s station, Classic Rock, Spectrum, Soul Town, Mosaic, and the '60s station. On my second page of presets, I have a few other channels that I tend to listen to not as often, but occasionally I enjoy opera, classical music and even the Willie Nelson station.
My husbands presets include the Springsteen channel. Most of the time they play Springsteen - it could be an album recording, or a recording of a live performance. It also might include other artists doing covers of his songs, or him doing covers of other artists' songs.
Although not preset stations, we also will occasionally use XM to listen to sports if we're in the car when a game is on that we care about.
Of all those channels, we've never had an issue with sound, either in the car, or at home.
I think you got a bum receiver.