SOURCE: I lose volume on HD channels with Directv
Reset the Directv box,by unplug it,replug it and hour later to let the last software to update.Replaced the HDMI cable,goto ur tv menu,goto sound functions,go down to reset it back to the factory setting.After this the the sound functions should be stable,and work.Not,than ur Tuner signal board have some kind of intermittion short in the board.Than must replaced the Tuner board to solved this problems.
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