Last night I experienced the first "no-audio" issue. Was flipping thru the DirecTv channels, (am a consummate channel surfer) when the audio completely dropped off.

The surround mode change was between DD and PLII, the DTV box is connected to the 970 with an optical cable.

Changed channels and audio came back partially, turned 970 off and back on again and audio came back in full.
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Outlaw 970 * Adcom GFA 7000 * Musical Fidelity X10v3 * Pioneer DV-45A * Cambridge Audio Azur 640 v2 CDP * DirecTV HR-20 * Onix R-DES sub eq * Magnepan MG12/MMGC/SS1 * 2x MartinLogan Grotto subs * Optoma RD50 DLP * Panamax 5500EX * Harmony 1000 remote