triax tri link

hi, i have a triax tri link with magic eye from my h5 2tc box to tv upstairs, its worked perfectly for a couple of years, now the picture keeps flickering, has gone faint and keeps saying bad signal? I've checked all connections are tight and intact, all lights on the trial and the magic eye are still lit up, should i try a different channel on the trial box? or any other suggestions please
 
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