Have a Genie system with a 4K client and 2 other HD clients. Lately the 4k client has been giving me Loss of Signal 771 message in nice weather, or picture just disappears but I can bring banner up or it stutters/hesitates. Just a little while ago it went off and when it came back on I got a "Your TV doesn't support 4K, 720, 1080 and to check for other HDMI inputs on the TV". Called for Tech Support and the robo-tech said to change the channel up and down and now it's working, but what is causing all this other garbage? Frustrating as heck.