My security cameras are coming in purple/green and fuzzy. Is there anyway that I can fix them?

They are both located outside, under awnings so if it were to rain they would stay dry. They've worked fine for about a year now all of a sudden this happens. Two other cameras are working fine I've unhooked a working camera switched it out with one of the ones that has the issue and have determined that it it's the camera itself. they do have the nightvision feature which does click on and off. I've tried forcing that to happen and yes it clicks but it doesn't fix the image I've tried messing with the settings that does nothing either