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LG 55UN74003LB smart TV audio cutting in and out


majorol

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I have an LG 55UN74003LB smart TV running webOS 5.2.3-252113 with firmware version 3.23.45 and there is a pretty oldschool Samsung HT-DS400 5.1 home cinema system via opticla cable.
Audio cutting in and out constantly when I am playing media that is utilizing the WebOS (e.g.: TV's Youtube app, Netflix, screenshare from mobile, playback from USB attached external drive).
The sound is however flawless when I am using my PS4 or media-box that are connected via HDMI to the TV.
I tried all the possible combinations of the digital sound output (auto, PCM , passthrough) and the format of the audio (MPEG, Dolby Digital/Plus, auto, HE-AAC) with no luck.
Furthermore I purchased a Panasonic HDMI ARC exteactor and diverted TV audio to HDMI ARC port but the outcome was the same:
Flawless audio from mediabox and PS4 and cutting in/out when using TV for playback.


This leads me to beleive that cabling and my Samsung 5.1 sound system could not be the issue, 
but there might be something wrong with the TV... possibly firmware issue or something.
Has anyone faced the same, and if so, does a relatively easy fix exists?

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