I have two of these cameras. One pointed outdoors, one viewing indoor activity.
The one aimed indoors (living room area) occasionally, reverted to washed out ‘night vision’ lack of color in the middle of the day with plenty of day light available.
I had to turn night vision on then off again to get color back. I believe I’ve solved that problem now.
Went to settings, set up ‘day mode schedule’ > 7:00 to 23:00 every day. Been a week now and not once has it reverted to washed out black and white colors in the middle of the day.