My Samsung DV HD931 is having issue with some dual layer DVDs when it cuts over to the 2nd layer usually about 1/2 through a movie. When it first started happening I thought the DVDs were flawed. Since I have a couple years on the Sammy with lots of hours, the laser output may be decreasing. I cleaned the lens and that didn't help any. I have a Pioneer Elite DV45A and that reads the DVDs the Sammy has issues with perfectly.

Except for the lame remote and slow response time of the buttons, I've been very happy with the DV931.