Same problem, but I don't think it's related to humidity (at least in my case). Even after a hard reset I didn't solved. The image is pink on left half, there's a soft/dark band in the center, and it's greenish on the right half.
On night mode the right half of the image is totally black.
I don't hear the "click" that the camera should produce when switching to night mode and back to day mode (electrical problem? camera sensor magnetized or with static electricity on it?)