When watching an analog mono channel the channel banner in the upper right hand corner pops up randomly and indicates stereo then back to analog. I have checked for both too high and too low signal strength and tried with and without amplification and the problem persists. I have also tried connecting at a different physical location and still no change. At first Sharp indicated it was the cablecard which seems odd since the analog connection bypasses the cablecard. The HD and digital channels are perfect. Cox Cable came to test the lines etc and found no problems. Sharp, on the other hand has been zero help. Any ideas?