Edited UVs distorts when mesh is smoothed


Hi everyone! I´m having a problem with a mesh I´ve modeled and unwrapped its UVs. In the UV Editor shows fine, but in the rendered version, it gets distorted in a weird way unless I don´t smooth it. It´s the first time it happends to me. I´m using Maya 2014. Here are the snapshots of the UV editor and the render test I made.

Again, never happened before. I made the UVs and after I smooth the mesh to render with Mental Ray, the UVs were fine. I already try to Smooth Mesh instead of the preview subdivision level, with no luck. Any advise will be really apreciated. Thanx in advance from Argentina.