1D Mark III ISO Issue

Only in the TV mode, my ISO bounces all over the place 100-3200. Other modes work just fine. Besides the obvious, any ideas?

Is the safety shift mode switched on?
C.Fn I -8 Safety shift
0: Disable
1: Enable (Tv/Av)
This works in the shutter-priority AE (Tv) and aperture-priority AE (Av) modes. When the subject’s brightness changes erratically and the correct autoexposure cannot be obtained, the camera will change the exposure setting automatically to obtain a correct exposure.
2: Enable (ISO speed)
This works in the Program AE, shutter-priority AE, and aperture-priority AE modes. When the subject’s brightness changes erratically and the correct autoexposure cannot be obtained, the camera will change the ISO speed within 100 - 3200 automatically to obtain a correct exposure.C.Fn I -8 Safety shift
0: Disable
1: Enable (Tv/Av)
This works in the shutter-priority AE (Tv) and aperture-priority AE (Av) modes. When the subject’s brightness changes erratically and the correct autoexposure cannot be obtained, the camera will change the exposure setting automatically to obtain a correct exposure.
2: Enable (ISO speed)
This works in the Program AE, shutter-priority AE, and aperture-priority AE modes. When the subject’s brightness changes erratically and the correct autoexposure cannot be obtained, the camera will change the ISO speed within 100 - 3200 automatically to obtain a correct exposure.