I have had a similar problem with my 2015 Brounder 35K. It started a year ago. The camera flashes on the off, or it sort of rolls from on to off.
Posted this information a couple of times, but do not hear any replies on this form. It is still doing this.
One thing that sort of helps, is to turn on the turn signal. When those cameras are used, then the back up seems to work better. Never works as it should, but does work better.