I have a Gardena water distributor, which has four hoses attached to it, and five and six is capped and closed for the Gardena water distributor. The distributor is working with the Gardena water computer. Now, when I turn on the computer manually for water, it goes through a cycle of all the four outlets and then gets stuck at five. For it to work again, I have to open the hose from the top and release the pressure, and then it automatically resets to one. What can I do to permanently fix it and what is causing it?