You didn't mention what you played the DVD on. I had a similar issue with a Liteon DVD recorder and a Panasonic DVD player. Sometimes when I paused or skipped ahead the sound would stop when played on the Panasonic. The Panasonic played DVDs made on a different model Liteon with no problems. I suspect that one or the other did not follow some standard exactly as intended. And since the newer Liteon didn't make DVDs the Panasonic had problems with, I assumed it was the Liteon recorder's "fault". My point is, things like this happen and you probably won't know it until you get it home. Also, anytime there are problems, sometimes a newer firmware fixes it.
Good luck with whatever you buy.