The Dolphin Maytronics vacuum works fine until it tries to go across the pool, when it loses power and stops. We discovered that the problem is inside the 360 degree plastic cylinder where the cord is near the unit under water. Something inside the cylinder stops making contact, then it loses power. If we lift the unit and push the cord together from both sides outside of the cylinder, the unit begins working again (until the cord tries to move away again.) Is there something we can do to fix it, or does it need to go into a shop? This is a new problem - it's always worked fine until now, and the warranty recently expired.