I have a Panasonic TH-65FX600A (3 weeks old) connected to an LG SG9 sound bar via an HDMI 2 high speed cable thru the ARC HDMI 2 port. A Pioneer bluray player is connected to HDMI 1 and a Panasonic bluray player/recorder is connected to the sound bar's passthru port. This setup was working perfectly with my previous TV. The problem seems to be with the ARC input on the Panasonic. Changing inputs sometimes causes the sound bar to loop between mute and sound requiring the sound bar to be turned off and on again. I want to use ARC just like the old TV, not an optical cable. Any help would be greatly appreciated.