Arris xg1v4 box sound connection

I bought one from Best Buy, Insignia. It works, but there is something that causes the picture to fail occasionally, and I have to disconnect and reconnect it. I'd look elsewhere if it hadn't cost $50. This may be more warning than recommendation. 

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@Alphonse2021 wrote:

I want to connect my Xfinity Arris xg1v4 box with my sound system that has RCA inputs. Can I use an HDMI audio extractor? Which is the best one for the job? Thanks@Alphonse2021  Xfinity TV Equipment Self Install

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kis this by chance for feeding audio to a bluetooth type setup or similar?