Is this on your 2007 Southwind? That coach isn't that old. Does it happen while driving or parked? Driving could have issues with the inhibit relay to turn TV off while driving. It could be loose connection on relay. Location various but normally close to TV.
On some of the older coaches, the TV was used for the back up monitor and would come on when the vehicle was put in reverse. Any chance that is what you are dealing with?