Mental Ray Maya 2016 trouble

Senergy

Hi there guys,
I am going to render a model for a job presentation and as I am not good in rendering and I also got up for Maya 2016, I am getting in trouble doing the render test for my shaders.

Basically, when I render my stuff, it gets like a strange tesselation on the specular light part.

Anyone can help me to solve out?

Thanks everybody

oglu

are you sure there is no texture in the refelection slot..?
may i see the shading network...