The signal strength keeps going up and down. While sitting in a stationary position with a clear view of the sky. It goes from 3 bars to 2 back to 3 then drops to one. then the process repeats continuously. I had the same receiver for years never having this problem. Had to replace it with a new one. And now this.

Audio Players & Recorders - Sirius - Starmate ST2 Satellite Radio Receiver