Hi and welcome to the forum.
I had the same problem on my 07 Ellipse. It was intermittent at first and then turned into a hard failure. My extended warranty paid to have the system control unit replaced.
The one Winnie used is no longer available but they provided a compatible replacement. A call to their tech support could help you out a lot.
Best of luck.
Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.
2007 Itasca Ellipse 40FD