It was working fine and then just stopped working two nights ago. I have an older Samsung smart TV. I have tried changing HDMI cables, turning Anynet on and off, disconnecting the ARC power and HDMI, re-connecting them and nothing seems to work.
Best answer by srosvold
I found the solution on another thread here.
Simply unplug the power cord from the TV, let it sit unplugged for a few minutes, plug it back in and voila!