Had an issue with the RH camera on the coach that was a programming problem. When the Right turn signal was on the camera would flash every so often and there were grid lines faintly in the background. I contacted the manufacturer, Rear View Safety, and they walked me through the fix which was simply programming the monitor to function correctly. It depends on who made your system as to how to correct the issue but its worth a try. Good Luck.
Steve n' Tammy with Ella Mae the "Shippet" in a 2003 Fleetwood Bounder 32' on a Ford F53 Chassis and a V-10 gasser pulling a 2013 Ford Edge on a EZE Tow Dolly