I have the same issue with the SiriusXM app - it seems to stop periodically. About the only thing we can do is contact support. Hopefully, if several people have the same problem, and enough of us report it, they might update the app to work better.
Is every one still having issues with this app? I want to know if it works now before I upgrade my subscription. I used my trial forever ago and decided not to upgrade because I was having this problem.
I use this app without issues as long as I'm on 3G. On WIFI it disconnects constantly. On my D2 there is a setting that turns off wifi when the display goes off. It's a power savings thing I guess but it still disconnects with it set for always on.