Had the same problem, as have many others who lOOK for field losses. I chose to trade my 9500 after many trys by company people to fix the problem.No combine is perfect but Deere really has some work to do to avoid the walker problems on the 9000 series.Our field losses alone would have made the payments on a new rotor. Kuchar has some mods that are supposed to help.I think there is too much air blast to the walkers and not enough to the sieves, comparitively.