So I read up a little on hall effect sensors, I had thought they had something to do with the force feedback stuff. oops
As far as them not going bad however, I have seen posts here/elsewhere where the axis's are failing. So something is wearing out? Maybe the moving part is getting gumed up so as not to travel its full distance, or its center is changed because something stops the proper return motion. Maybe theres somekind of carbon buildup that interferes with proper circuit path? Maybe a ground issue.??