Originally Posted by Jayhovah

It's not warped, its uneven pad deposits. I've never had this problem since I got into a 370z, and I had the problem on both my 370z's. I had to have rotors machined twice on my 2011 and it still came back a third time. It happed on my 2013 as well.. this time I swapped the pads to StopTech Street pads when I had the rotors machined and it seems to have solved the issue, though it is too soon to tell for certain.