Vingli cleaner trouble.

Hey, my vingli cleaner is working but the hoses keep trembling and the head is not rotating. Plus is always doing a repetitive pattern. Can anybody help me with this?
Each time the diaphragm closes the hose contracts, trembles. That's what causes the cleaner to move. The head doesn't rotate, it is completely random and requires the curve of the wall or the hose being forced in a direction to cause it to change direction.
If you have directional fittings on your return lines, be sure they aren't pushing the hose in one direction. The head follows the hose
 
Each time the diaphragm closes the hose contracts, trembles. That's what causes the cleaner to move. The head doesn't rotate, it is completely random and requires the curve of the wall or the hose being forced in a direction to cause it to change direction.
If you have directional fittings on your return lines, be sure they aren't pushing the hose in one direction. The head follows the hose
Thank you very much. What can I do with the repetitive pattern?