Try moving the HDMI to a non-CEC HDMI port on the TV.
I just purchased the Samsung HU85550 and am having an audio issue. My entire system runs through a Sony STR-DH540 amp. The entire system runs via HDMI cables.
When I turn on my system all is fine. 10 seconds after the audio turns on, the amp changes the audio out to TV instead of the correct Cable/Satellite. I then have to go in and change the audio out setting back to Cable/Satellite.
Any ideas why this happens? My old Sony television had zero issues. I have tried a number of different settings on the new television, as well as the order in which the devices turn on. any ideas?