I have a 2016 bx2370 with 60 inch mower. 2 weeks ago I had problems with the pto not staying engaged to the mower deck. I got that fixed and now when you set the cutting height knob it won't stay where you set it. When you raise or lower the deck it will ratchet down to a lower setting. I start out with it on 3 and awhile later I look down and its on 2. Thought I would ask here before I call the dealer. It's probably something simple I'm not doing right.