yes both h5 and h7 tournament edition have ground loop noise problem on their mic by some reason. i have h5 tournament edition and it have the worst kind of ground loop noise on its mic from the start. i did claim it once, the company sent me a new one in 2 weeks later but sadly the problem still the same. one of my friend have h7 tournament edition and he told me he also have the same problem.
some people may say it is my fault that not have ground my pc proper. but i living in the old house plus on the 2nd floor, grounding it is impossible. more than that in these days there are other brands that not have ground loop noise on their mic or they was fixed it long time ago such as Logitech, hyper x (since stinger model), sennheiser, steel series (the worst it can be is just a low quiet hum sound).