I have a Samsung sound bar connected to my Samsung tv using eArc and up until today my remote worked fine controlling the power on/off, volume (up/down/mute). But to I can no longer turn the volume down, I can only turn it up or mute it. Power still works fine. If I plug headphones into the remote the volume control works fine so I do not believe it is the button. I have unplugged the cable and reset it and checked all the settings and they are fine. Any ideas?