After a few years, the ARC HDMI option went missing from the sound menu. Eventually I replaced the Connection box with one from my other samsung TV and the ARC HDMI option returned to that tv. (but was no longer available on the other tv). So I decided it was the connection box.
The next day I noticed that once again, the ARC HDMI option is missing and I can only assume that something is causing the connection box it cause a fault. Has anyone got any idea what to do. I do not want to put another connection box on for the same thing to happen.