There is a TSB about the rear camera on KIA's. This bulletin is for many different models of KIA. The TSB is ELE077R1 or ELE-0771 or other variations on the naming. Here is some of the info I was able to pull (not the whole thing) for it:
077 (REV 1, 01/29/2015)
Multiple Models (See table)
REAR VIEW CAMERA DIAGNOSIS/REPLACEMENT
1. For customer complaints related to intermittent operation from the rear view camera, perform the following checks:
^ Confirm the parking guidelines are displayed on the AVN screen. If the guidelines are present and the vehicle owner resides in an area with high humidity, snow or rain, replace the rear view camera with an improved part.
NOTICE For concerns related to intermittent operation, always try to duplicate the customer concern, prior to replacing the rear view camera.