Unfortunately, the Samsung BD-P1400 is a problem plagued unit. I have the BDP-1500 and have zero problems with it, other than it runs very hot. I added larger rubber feet to the bottom and run a separate fan to cool off the unit on the bottom. If you play a few movies back to back in this unit, it will heat up and start to skip and act up without it. Not sure why they decided not to put outside fan cooling on this one, but it sure needs it. If you are having possible cooling issues with yours, such as the white speckles, you might also try a separate fan. I just got a 6 inch clip on one, and stuck it on my shelf. It also cools off my CD carousel and HD-DVD players, too.
And regarding film grain, this is a sticky complaint often heard about remasters on high definition media. Once a movie is filmed, there may be a lot of low lighted scenes where film grain becomes evident. In post production, or during a remaster, film grain can now be added or removed from a remastered print when it is being transferred to a new media. A good example of this is Sleepy Hollow. The HD-DVD version is a nice transfer with minimal film grain evident, but the blu-ray version is about twice as bad in terms of graininess, which on a large screen looks like sandblasted crap. I also owned this movie on DVD and didn't notice a great deal of film grain except during low light conditions. I saw this at the movie theater, too, and I didn't really notice that much grain then, either, so I know this wasn't an intentional effect on the part of the director or producer.
Once the film finally leaves their hands, the remaster chop shops can pretty much do as they please with the end result and the original movie makers are frequently not consulted on the final quality of the remasters at all. And when you compare Hi-Def formats such as HD-DVD to Blu-ray, you find that a larger capacity is not always better if it means they simply add more digital noise, or film grain, to a remaster to try to reproduce the directors original intent. This is also evident in the Godfather series Hi-Def remasters. I have a better scientific explanation of this film grain restoration process saved on another PC as a PDF. file, but this link somewhat explains it.
Intelligent removal and application of video film grain noise