Floodlight Cam Night Vision Makes Image Unviewable

I installed a refurbished floodlight cam a couple of days ago above my garage doors. The image during the day looks great, but as soon as it begins to get dark outside, the image turns extremely dark and has bright flashes of pink and yellow. It gets stuck like this even after the sun comes up. If I cycle power to the camera, the image is fine again until night time. What can I do?