Hi. I recently got a Sony Bravia xf87 TV. I have been trying to get my LG soundbar to work through the arc port but have ran into a problem. The soundbar works fine but when I turn my tv off the next time I put it on it reverts back to tv speakers. I would like my TV to stay on audio system instead of going back to TV speakers as it's a little annoying having to change every time. Any advice would be appreciated.