My 2014 Subaru forester Vibrates at high speed only (over 60 MPH) and only when going straight. when i turn the wheel even slightly on a freeway (like when changing lane) the vibration stops. I replaced the cv axle shaft and the problem persists. It also stops when im on the freeway and hit the brakes but only for a moment, then it continues as i coast or step on the gas. I also got a tire rotation recently so its not a tire. Im really running out of ideas.