Problems with my Player

I recently bought "ALIEN - The Director's Cut", and while watching the complete featurette it froze up halfway through. I brought it back to Best Buy and got a new one, but the same problem happened in the exact same spot..... so I stuck it in my Playstation 2 and it works just fine.

Over the weekend, I watched "The Lost Boys - Special Edition" and found that some of the supplements don't work on that either, but again, it works fine in the Playstation.

It's obviously my player. I don't have a top of the line player, but it's not a cheap one either. Does anybody know why this happens? I could understand if the whole disc doesn't work, but I don't understand why some of the supplements work, while others don't. Do DVD players deteriorate over time? Would cleaning it help the problem?

[cjg]

Have you used a disc cleaner sometimes thats all you need

[dwatts]

I'd guess it's the position the supplements are encoded on the disc that is the issue.

[Katatonia]

The Alien DVD does that in one of my DVD players also. On another player it doesn't do it...bizarre. No visible marks on the discs.