It's unclear where the sound is emanating or where it is lost in this scenario or even the type of connection you're using to carry it.
It almost sounds like you're using the TV for sound or it's in the audio path. The sound from any high end source should be processed by the SONY DAV as close to its original device as possible and not unnecessarily patched through the TV.
The TV only NEEDS Video. High-end Audio is wasted on it.
The symptom sounds suspiciously like a loss of data from the source to the Sony DAV.
Please clarify or establish that this does or does not happen without using the remote. Sometimes remote commands are heeded by unintended devices. Try to Pause/Play sequence using front panel buttons on the unidentified Samsung BluRay to eliminate that possibility.
http://www.retrevo.com/support/Sony-DAV-IS10-Home-Theater-Systems-manual/id/2771ag604/t/2/
Observe the indicators on the Sony for any clues when the problem occurs.
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