Unfortunately, from my research, there is a massive bug with Samsung TVs' CEC. People have been complaining for over two years and Samsung either can't or won't fix it. The solution is to go to your settings and turn CEC off, then turn it back on again. And voila! You have sound again. Unfortunately, you will be doing this for a long, long time because it's probably never getting fixed. I've been doing it daily since I got a soundbar 4 months ago. My TV is too new to shop for a replacement, but when I do, you can be assured that I will never, ever buy a Samsung TV again.
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