Did replacing the camera fix the intermittent problem? My 2014 Focus Electric just started doing the same thing.... sometimes it works, sometimes it doesn't (I get the "camera not available" message), and sometimes the camera even stays on after I've shifted into Drive. I've tried disconnecting the battery, updating Sync (as of 9/24/19), and removing/unplugging the camera to look for a loose connection. A new camera costs $300 and I'm not convinced that the camera itself is actually the problem. Any advice would be greatly appreciated!