I had this same issue, but when I went to the navigation map, there was a circle with a slash through it too. No navigation and no SXm radio. I took loose the head liner on passenger side and was able to take off the antenna, I found that the seal was leaking around the parameter. I was able to scrape off all the old seal and clean the area with 91% alcohol. After letting it dry and making sure the inside of the antenna was dry, I put a bead of RTV where the old seal was. I then put everything back together and haven’t had any problems in 7 months. Again, take the antenna loose and dry it out, hair dryer or air dry, to see if the signal comes back. If it does, this is the route to go.