I have a 2018 3791rd , same issue , I took it in to be fixed , they said it was a bad coax end , i took it home and had the same issue , i removed all the goofy coax splitters behind each wall plate , as well as the main splitter behind the wall , directly screwed each coax into the main input , the dark brown coax is your antenna, I kept it out , so know I have 3 short coax whips connected to a 3 way , if I use the antenna I connect the brown wire , if I have cable I connect it to the 3 way , I also have a dish which my LR tv is the bottom coax , so I connect my dish directly to it and keep antenna or cable to the other 2 . It took about an hour to rework , but since then I have never had an issue
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