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HW-MS650 via ARC--No source audio at startup, fixed by power cycling.

HW-MS650 connected to LG OLED55B7A via ARC. When the system is first booted (Apple TV, LG OLED), soundbar automatically boots, displays D.IN but no audio comes out. Audio is restored after either power cycling soundbar or disconnecting and reconnecting HDMI cable. Soundbar works great otherwise (volume changes via ARC, bluetooth connection to Phone, etc), just this annoying issue at each startup. Any ideas? Thanks for your help.