Hello, I'm glad you posted this because I have the same thing on my BX2200D. I first noticed it last fall when traveling a long straight dirt road. The tractor wandered one way or the other and when the steering wheel was turned, the front wheels would not respond -- SOMETIMES. Intermittent problem, the worst kind to diagnose. Well, sometimes this would happen and you could turn the wheel almost a FULL turn and just nothing would happen! Very scary. Now, I never noticed this cutting grass (my primary use) but only when traveling straight long distance on a smooth surface when the wheel is hardly being moved at all. Why not taken to dealer before now? Bad news, my local dealership went belly up. But the closest one, about 40 miles away authorized a local mechanic to do some of their field work and he has the tractor at this moment. Right off the bat he suspects air in the lines. I am not worried in the slightest. I love Kubota. Film at eleven . . .
Hope anyone else who has experienced this will post.