I have a 4670X connected via wireless. Sometimes when I play video or rewind video on Netflix, Hulu or Prime video, I get a loud buzzing noise. I cannot hear dialogue when this happens. The only way to fix this is by rewinding the video and the buzzing goes away.
The wired connection didn’t fix the issue. I think the issue lies with the external audio speakers. I’m not having the issue with the TV speakers. I’m going to replace the HDMI cable with a new better one. I’m sure the one that came with the soundbar wasn’t the best quality.