Audio Systems: defective disc/DVD, smudges, reflectivity

Question
i recently purchased a muti-disc set from Amazon and one of the DVDs was a flipper disc with a movie on each side. when i played the disc it froze at a certain point in the movie and then the picture began pixelating. i checked the disc over and there were no prominent scratches or smudges to cause this problem. this happened on both sides at approximately the same point. what causes this? i have never had this problem. i have over 560 discs in my library. it hasn't happened since. it happened on 2 different players. one player was a new one.

Answer
This problem, when it is at the same point on the disc is almost always a defect on the surface of the disc. It is rare that defects of this kind are seen by the naked eye.  They are most often a result of poor plating or coating in the manufacturing process and because of the poor reflectivity the decoder in the player gets overloaded with raw data that is full of dropouts and cannot keep up.

Take the discs back to the retailer for replacement. That is my suggestion.

Cleggsan