When I had substantially similar problems it was related to a line issue. A part in the pedestal that never goes bad had to be replaced (they decided the part was about 30 years old or so). A contributing factor was also that the line had too many "kinks" or "bends" that caused "noise" in the signal. They have to replace the line from the pedestal to my house for this problem. I don't really know what this means, but that's what I was told about my problem.
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