Doorbell camera picture quality is sometimes poor

Every so often, the colors on my doorbell camera video are washed out and not very vibrant.  It rarely lasts more than a day and then would go back to normal. Starting and restarting the app made no difference.  It hasn't happened in a couple months and doesn't happen a lot, so I haven't really worried about it.  However, when it happened today, I tried changing the picture quality from 720p to 480p and that fixed it.  When I changed it back to 720p everything was still working good.  

Does anyone know what this means?  I have screen shots to show the difference, but I do not know how to post them.