Did you know that the first patent for a dishwasher was issued in 1850? You would think that in 150 years they would have this thing perfected. Generally, @ 90% of the time, This is a hose problem. One of two things to check first. Make sure the hoses are tight and not leaking. Plastic sometimes causes havoc with clamps. Never use a petroleum product on plastic or it will leak for sure. Second, make sure the hoses are routed properly. It should provide a smooth even flow, with no kinks, sags or twists of any kind, especially on the outflow side. Also check your air gap for any cracks.