DIAGNOSIS HDMI-CEC control is active. Another device on the same HDMI ARC/eARC port is sending a wake-up signal.
FIX Disable HDMI Control on the YAS-209. Press and hold the Volume Down and Program buttons on the soundbar remote for 5 seconds. The display will show HDMI Ctrl Off.
IF THAT DIDN'T WORK The issue may be coming from your TV. Go into your TV's settings menu and turn off its CEC function. This is often called Simplink, Anynet+, Bravia Sync, or similar.
HEADS UP Turning off HDMI Control means you lose the ability to control soundbar volume with your TV remote. You must use the soundbar remote.