Tilt bucket problem on my Kubota Kx101-3@, 2007

Hi
I have a problem with the tilt bucket on my machine. It starts to 'walk' slowly to one side when i activate the aux hydraulic. And the auto idle don't cut the RPMs on the engine when the aux hydraulic is activated. But when i push the aux button on top of the right joystick litle left, the auto idle works as normal. It seems to me like the aux button isn't i neutral, so litle oil leaks trough the system and holds the auto idle activated.
What is wrong, electric, hydraulic valves,??...

Thanks Thomas