Sat- Directv HR22 HD DVR
Remote- Harmony 1000
Sat & Blu-ray are connected to receiver via HDMI 1.3 cables.
Receiver out to TV via HDMI 1.3 cable.
TV speaker setting is set to "Audio System"; Audio out set to "Fixed".
TV displays something like 'switching to external source' when powered up and working correctly.
When I turn everything off and then back on, most of the time (more than occassionally) the TV speaker setting will revert back to "TV Speakers" and the amp mutes itself. When this happens I always have to press the mute button on the remote to turn the muting off and go back into the TV settings to change back the aforementioned settings.
Are you using hdmi control? If so, disable it. Then disconnect all inputs to the tv, and attempt to replicate the problem. If it can be reproduced with no connections and hdmi control off, the tv needs service.