I followed the instructions at the beginning of this thread and as soon as I tried to update a single module I got Vehicle Network Communication error on my Sync screen. I was starting with the instrument cluster update. It subsequently failed. I had to disconnect my battery to get the sync...
I have something similar--when I get a phone call sometimes after the call has ended, it will either not switch back to Sirius or will start playing the last song I was listening to. Also, if browsing the web and the page happens to have video, it will automatically switch from Sirius to Media...