My Arc has been having issues with connecting to my Samsung TV. Prior to switching to the Samsung, I had a older Vizio. The connection issue happened with the Vizio as well. I would just unplug the HDMI and/or unplug the Arc and the audio would come back. That is not the case with the Samsung. The option for Home receiver Audio output on the TV goes away.
Also, I do use a Nvidia Shield for my content.
Is this a cable, TV, or Arc issue?
I have replaced the HDMI and seems to still happen.