Sounds like it could be a problem with signal levels. Reboot the STB and hold down the UP & DOWN buttons on the D pad on the front of it, That takes you to the engineering pages. I think page 6 or 7 has the signal levels. post the average signal levels here so we can see what they are please.
Could be that the attenuator is the wrong value, or the connector in the line cab is oxidising.
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