Mad Dawg

I haven't had very many problems with my JVC-501, unlike many it seems. But I noticed something odd the other day. I played T2 DTS, and it was flawless. No problems with seemless branching, no problems with sound...just perfect. But then I purchased Twister DTS, and I was having some severe sound drop-out. It would occur about once every 5 minutes, sometimes even more frequently, and I eventually had to just switch to DD. I've searched and seen that this player has been known to have issues with certain movies, but I didn't see any problems arising with one DTS track playing perfectly and another dropping out. Any ideas on what I can do, or could it just be a bad disk? Thanks!