I just installed a new AU8000 65" and it works fine except for the fact that when I turn on the TV and my AT&T TV streaming box, the channel comes on for a couple of seconds and goes away. The TV apparently thinks there is no signal and either goes to another HDMI signal or tells me there is no signal. Then I have to manually chose the HDMI port in order to view the streaming content.
Support was no help. I've tried several different broadcast profiles (since there is none for AT&T TV) to no avail. I've changed out the HDMI cord but no luck. All HDMI ports are working fine (I have a ROKU stick in another one.)
I hate to have to return this monster because of this problem but it's annoying to have to go through several steps with 2 separate remotes in order to watch TV.
I have the ATT NOW streaming box and it sometimes switches to different HDMI source as well whenever I turn on the TV. I actually read on forums that it's a bug on the ATT NOW box that needs to be fixed by ATT.