well i have this issue for a long time, different maya versions and different pc's, i dont always have this results, but when i do it made me not happy, i found only one thread about this and there are no real solution to this, so maybe here i can find some advice. As you can see on the image normal creates some weird stuff
http://joxi.ru/zAN5Gv1Tdwbn29.jpg
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(I did a search for "normal banding")