My sound was cutting out only on HD channels. Tech visit changed wiring from street to house, checked signals, etc. Left without solving the problem, and promised to check with "someone". While waiting, I changed from optical to coax digital output to my receiver. No change. Still dropping out. I installed RCA analog audio lines from the cable box to my receiver. Didn't hear any dropouts, but sound was worthless. Ugh! Went back to optical cable, but left the RCAs connected. No Dropouts!! So either, swapping back and forth, optical to coax, somehow cleared up the problem...OR the problem was maybe a ground fault cured by the addition of the RCA cables. Your guess is as good as mine. Been watching over an hour now and still no dropout on any channel.
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