HELP ME PLEASE!

Sometimes my BS Player can play films only without any loud. At the first 5 seconds there are voices but after that it suddenly starts to falter and later it disappears. do you know the reason for this? What should I do to solve this problem? Help me please!

[Tizio]

Have you tried to play those movies in other players (Windows Media Player for example)?
If you play them in other players do you have the same behaviour?

What kind of audio stream does your movie has (you can check it with GSpot)?