DL3 Interlacing Problem

I have some odd thing happening with my DL3's. In my mockup I have three fixtures in a 1x3 collage. If I have a movie running on layer 1 and then add another movie on layer 2 and then try turning that movie around using the Z Rotation or try panning it around using the X and Y position, the image on Layer 2 will start breaking up digitally. Almost like a bad interlacing problem but worse. Makes it unuseable. The only way I have been able to avoid it is to put the image onto a 3d globe and move that around.