Can't get the arc to work

Sep 19, 2018
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I have a 55" LG smart tv and a Yamaha amplifier. I have a high speed HDMI Cable going from the arc HDMI 2 port on the tv going into the arc port in my amplifier all the settings on the tv are correct as they are on the amp. Arc is activated on the amp and tv and when I turn it on and off and volume up and down it all works. My problem is evertime I turn my tv on the cable box turned on and the amp and it automatically goes to HDMI 1 which provides sound then switches every time to audio 1 where I have a picture and no sound, I then have to go to setup on the Yamaha amp and it instantly changes back to HDMI 1 and I have sound I can also instead of using the amp remote get of the couch and press the scene button or source and it will work. It constantly will switch from HDMI to audio 1 everytime you turn the tv on. Super frustrating.