I have a four year old AVIC 8600 NEX unit, and a Sirius subscription that hasn't had any problems. Suddenly this week, the icon is greyed out, and inaccessible. The Sirius settings are inaccessible, etc. Everything else seems to work, and I can play Sirius through Bluetooth from my phone, but obviously that's not the goal. Satellite seems to work (I can access mapping). Sirius refreshed the signal, does nothing. They are no help.  I'm comfortable removing the unit, and if I need to replace the sirius receiver, I can prob do that, but I'd prefer to try everything else first. Ideas?