I'm having trouble using ASIAIR Plus for stepping through focus. It started out ok, but now matter how many max. steps I set for fast movement - 1000, 2000, even 3000 - the ASIAIR will only move 100 - 200 steps. I can't get it to move any more. If I use the EAF hand controller, it works fine. I'm using the latest ASIAIR firmware and app.