Since the time I bought the tv [LNT4661F], I have used directv. I recently switched to streaming [Roku, Fire Stick, RPi3]. Audio cuts out on a frequent basis and does not come back on, no matter how long I leave it. Occasionally, I lose video as well. This happens on all 3 HDMI ports. I have to either power the tv off and back on or cycle through the inputs. The latter does not always correct the issue. When I had directv, I had both HDMI and RCA connected. Each time I booted directv, I always got the Not Supported Mode message, then it went on to boot successfully. I still occasionally get that message when the video drops. Does anyone know of a DIY fix or workaround?