Some Movies have problems

[DVD-Dude]

Questions to all:
Just started.
I'm using DVD-Shrink(latest version) and then Nero burning rom(latest version). Using Sonic DVD-R (shop4tech) and burning at 4x using Pioneer 109, closed all programs including internet during burn.
Most of the time I'm getting great results with the movies but some burns the movie freezes for a second and looks like little tiny squares(like big pixels) for another second and then continues to play normal throughout the entire movie on my stand alone player (Coby). Always plays perfect on my PC.
Can anyone help with solutions to this problem?
Thanks.....Happy shrinking and burning wishes to all!
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[LT. Columbo]

sounds like simple media issue. see below to find GOOD COMPATIBLE media for your burner. try maxell, even try burning at 2x if poss.