I60 wind direction problem

I installed an I60 earlier this year and for the most part it has worked well. The last few days, however, the wind has been a bit stronger (15 - 25 knots) and the close haul repeater display has stopped working properly. It just points to the bottom of the gauge despite the wind angle being only 45 degrees. When the wind drops down to 10 knots it starts functioning again. Any suggestions?

Thanks
Tim