My Dolphin's cable is tangled.
To solve this malfunction, after using your Dolphin, straighten out the cable completely and let it air dry before winding it up.
Also make sure that the cable is wound correctly after each use.
We recommend that you also check that nothing is obstructing the Dolphin wheels or tracks as this could cause the Dolphin to spin in circles and twist the cable.
Also, you need to know the best place for your Power Supply (we recommended at the middle of the pool).
Note : the swivel is a system to avoid twisting the cable. Some of our robots have them.