I seem to be having problems with my rear view camera. When driving it will sometimes start to get distorted, then go dark. It will stay this way for a time then come back on as if nothing is wrong. When I use it at night it is so dark you can barely see the tail lights reflecting. It is a Weldex 3 camera system and the side cameras seem to work just fine. Is it the camera or the monitor that's messing up? It's on a 2006 HR Vacationer. Any help would be appreciated.