I have the drop-out problem. Here is what I've heard:

The sound goes silent for 1 or 2 secs and then resumes. It happens about 8 or so times during a movie.

1. both optical ports have the same problem. Is it my RadioShack cable.
2. seems worse at high volume...maybe only more noticable at higher volumes.
3. I'm now using coax connection and will see if it continues.